[kianf22]

Hey all! For those of you running the CG Precision downpipe, how noticeable are the performance benefits without a tune? Also how much louder did this make the car? Is it better to pair with the dinan midpipe or an axleback? Don't want to drone and don't want to piss off the neighbors too much. Was thinking of using a valve controller to close the valves for cold start, but not sure how much that helps. Any feedback appreciated!

[mike@x-ph.com]

No drone from the downpipe, 10-15 HP increase from downpipe only

[kianf22]

Originally Posted by mike@x-ph.com

No drone from the downpipe, 10-15 HP increase from downpipe only

will downpipe drone if paired with midpipe or muffler or both? How loud is the downpipe?

[kianf22]

Anyone experiencing throttle closure with catted downpipe w/out tune?

[Joe240]

Had zero issues with my CG Precision DS-1 downpipe on my m240i. Had it paired with a remus catback exhaust as well with zero drone. Had everything welded up too because the clamp connections had a slight exhaust leak. Because of this, I left those parts on the car when I traded it in. The dealer called me about 2 weeks later and asked if I left a tune on the car. Told him no just the sport cat and exhaust and he was shocked. He said it felt faster than a stock m240i he had on the lot and he did back to back drives to be sure (he was test driving with a customer which made him prompt the question). Guess 10-15hp is noticeable haha.

Valve controller won't fix your cold starts. The exhaust valve stays closed during cold starts already. It's loud because the wastegate is wide open during cold starts. With that said, cold starts were loud with the setup (even had the remus resonated midpipe instead of straightpipe), but after cold start it would idle so quiet that you'd hear the engine running up front before the exhaust.

At WOT the exhaust screamed beautifully. The DS-1 gets rid of the exhaust smell (wife hated it which is why I switched from catless to the DS-1) while still giving you the performance. Well worth the money. Oh and never had a CEL from the DP either. One of the few (if not the only one) catted downpipes that guarantee no CEL without using a flash tune.

[kianf22]

Originally Posted by Joe240

Had zero issues with my CG Precision DS-1 downpipe on my m240i. Had it paired with a remus catback exhaust as well with zero drone. Had everything welded up too because the clamp connections had a slight exhaust leak. Because of this, I left those parts on the car when I traded it in. The dealer called me about 2 weeks later and asked if I left a tune on the car. Told him no just the sport cat and exhaust and he was shocked. He said it felt faster than a stock m240i he had on the lot and he did back to back drives to be sure (he was test driving with a customer which made him prompt the question). Guess 10-15hp is noticeable haha.

Valve controller won't fix your cold starts. The exhaust valve stays closed during cold starts already. It's loud because the wastegate is wide open during cold starts. With that said, cold starts were loud with the setup (even had the remus resonated midpipe instead of straightpipe), but after cold start it would idle so quiet that you'd hear the engine running up front before the exhaust.

At WOT the exhaust screamed beautifully. The DS-1 gets rid of the exhaust smell (wife hated it which is why I switched from catless to the DS-1) while still giving you the performance. Well worth the money. Oh and never had a CEL from the DP either. One of the few (if not the only one) catted downpipes that guarantee no CEL without using a flash tune.

Thank you so much for your thorough response! Was originally going to go with a midpipe first but I can't ignore the performance gains! I leave my home early in the morning and the cold start worries me... but it seems like it will be worth it. Was just worried about throttle closures without tune but seems like that's only an issue with completely catless downpipes? Do you recommend pairing with resonated or non resonated midpipe? And will a muffler without valves cause droning in the cabin? Thanks again! How long should install be? ~2 hours? Do I need a gasket as well?

[valek]

Originally Posted by Joe240

Had zero issues with my CG Precision DS-1 downpipe on my m240i. Had it paired with a remus catback exhaust as well with zero drone. Had everything welded up too because the clamp connections had a slight exhaust leak. Because of this, I left those parts on the car when I traded it in. The dealer called me about 2 weeks later and asked if I left a tune on the car. Told him no just the sport cat and exhaust and he was shocked. He said it felt faster than a stock m240i he had on the lot and he did back to back drives to be sure (he was test driving with a customer which made him prompt the question). Guess 10-15hp is noticeable haha.

Valve controller won't fix your cold starts. The exhaust valve stays closed during cold starts already. It's loud because the wastegate is wide open during cold starts. With that said, cold starts were loud with the setup (even had the remus resonated midpipe instead of straightpipe), but after cold start it would idle so quiet that you'd hear the engine running up front before the exhaust.

At WOT the exhaust screamed beautifully. The DS-1 gets rid of the exhaust smell (wife hated it which is why I switched from catless to the DS-1) while still giving you the performance. Well worth the money. Oh and never had a CEL from the DP either. One of the few (if not the only one) catted downpipes that guarantee no CEL without using a flash tune.

@joe240

Hello Joe I´m curious to know about the difference in sound between catless and DS-1. I currently have got the REMUS catback with resonated mid pipe and the DS 1 and think is too quiet (previously I had the DS1 paired with deleted resonators and the axleback but drone made me buy the entire system with resonator), is there a noticeable difference in sound? is the smell too bad taking into account that even with the DS1 there it smells sometimes?

[kianf22]

Originally Posted by Joe240

Had zero issues with my CG Precision DS-1 downpipe on my m240i. Had it paired with a remus catback exhaust as well with zero drone. Had everything welded up too because the clamp connections had a slight exhaust leak. Because of this, I left those parts on the car when I traded it in. The dealer called me about 2 weeks later and asked if I left a tune on the car. Told him no just the sport cat and exhaust and he was shocked. He said it felt faster than a stock m240i he had on the lot and he did back to back drives to be sure (he was test driving with a customer which made him prompt the question). Guess 10-15hp is noticeable haha.

Valve controller won't fix your cold starts. The exhaust valve stays closed during cold starts already. It's loud because the wastegate is wide open during cold starts. With that said, cold starts were loud with the setup (even had the remus resonated midpipe instead of straightpipe), but after cold start it would idle so quiet that you'd hear the engine running up front before the exhaust.

At WOT the exhaust screamed beautifully. The DS-1 gets rid of the exhaust smell (wife hated it which is why I switched from catless to the DS-1) while still giving you the performance. Well worth the money. Oh and never had a CEL from the DP either. One of the few (if not the only one) catted downpipes that guarantee no CEL without using a flash tune.

To clarify, what exactly did you weld? You weld the downpipe?

[mike@x-ph.com]

Originally Posted by kianf22

will downpipe drone if paired with midpipe or muffler or both? How loud is the downpipe?

Depends on the exhaust/midpipe . If the exhaust drones, the downpipe will amplify the sound making the drone even more noticeable.

I recommend REMUS exhaust, it has zero drone.

[kianf22]

Originally Posted by mike@x-ph.com

Depends on the exhaust/midpipe . If the exhaust drones, the downpipe will amplify the sound making the drone even more noticeable.

I recommend REMUS exhaust, it has zero drone.

Remus exhuast with downpipe? Or Remus on its own. If i have this downpipe, should I go with resonated or non resonated midpipe?

[mike@x-ph.com]

Originally Posted by kianf22

Remus exhuast with downpipe? Or Remus on its own. If i have this downpipe, should I go with resonated or non resonated midpipe?

i recommend resonated if you are using it with downpipe

[kianf22]

Originally Posted by mike@x-ph.com

i recommend resonated if you are using it with downpipe

What is the difference between remus resonated and oem resonated pipe? Wider pipe?

[mike@x-ph.com]

Originally Posted by kianf22

What is the difference between remus resonated and oem resonated pipe? Wider pipe?

Stainless steel resonated front section instead of original front silencer,Original tube Ø 80 mm, REMUS tubes 2x Ø 60 mm into 1x Ø 84 mm

its louder than stock but not as loud as non res

[Joe240]

Listen to Mike, he’s been doing this for a long time. Remus has zero drone. What he meant by “if the exhaust drones then the downpipe will amplify it” is some exhaust systems will drone with the factory downpipe. If you put a catless downpipe on that same exhaust system, then the hallow, large pipe that is a catless downpipe creates space for more resonance, amplifying the drone sound in cabin. No downpipe will fix an exhaust system that already drones.

As far as the DS-1, I never had exhaust smell. It scrubbed the smell great. The catless was a noticeable smell, but for some people including myself it’s not a bother. Others like my wife find the smell to be nauseating.

As far as the welds, the connections that are held on with clamps were welded (with the exception of the clamp at the downpipe/turbo connection.

As far as sound between the catless and DS-1, both isle super quiet as mentioned before (engine is heard over exhaust at idle), but as the RPMs build the catless is noticeably louder (this would include the cold start). WOT is the same thing: Catless is much louder than catted, but both sound great with the resonated midpipe and Remus exhaust. Personal preference for a balanced, louder system is the resonated midpipe with DS-1. Much louder than factory where you want it without being too loud, no drone, and an exhaust system that retains the valve control (because sometimes cruising in comfort with a quiet cabin is soothing).

I think in total with the lift was about 2 hours for install, taking my time. Future exhaust drops for the downpipe swap I did in about 45 minutes (got the hang of things after a few removals when I found oil leak at turbo). First suggestion is remove the intake box in the engine bay. You can reach down and undo the clamp on the turbo/downpipe from there, as well as the 2 bolts that hold the downpipe in place. You have to disconnect the O2 sensors anyways before dropping the downpipe so you’ll already be in the engine bay. NOTE: the O2 clips are held in place with hidden clips. A flat head on the underside will push the clip to the side so the clip can slide off the rail. Those are things I didn’t include in my Remus install guide because that’s more for the downpipe install.

Here’s my detailed Remus exhaust install guide. Hope it helps give you an idea for the install process: https://www.2addicts.com/forums/show....php?t=1360037

[kianf22]

Originally Posted by mike@x-ph.com

Stainless steel resonated front section instead of original front silencer,Original tube Ø 80 mm, REMUS tubes 2x Ø 60 mm into 1x Ø 84 mm

its louder than stock but not as loud as non res

Perfect! Thanks again Mike

[kianf22]

Originally Posted by Joe240

Listen to Mike, he’s been doing this for a long time. Remus has zero drone. What he meant by “if the exhaust drones then the downpipe will amplify it” is some exhaust systems will drone with the factory downpipe. If you put a catless downpipe on that same exhaust system, then the hallow, large pipe that is a catless downpipe creates space for more resonance, amplifying the drone sound in cabin. No downpipe will fix an exhaust system that already drones.

As far as the DS-1, I never had exhaust smell. It scrubbed the smell great. The catless was a noticeable smell, but for some people including myself it’s not a bother. Others like my wife find the smell to be nauseating.

As far as the welds, the connections that are held on with clamps were welded (with the exception of the clamp at the downpipe/turbo connection.

As far as sound between the catless and DS-1, both isle super quiet as mentioned before (engine is heard over exhaust at idle), but as the RPMs build the catless is noticeably louder (this would include the cold start). WOT is the same thing: Catless is much louder than catted, but both sound great with the resonated midpipe and Remus exhaust. Personal preference for a balanced, louder system is the resonated midpipe with DS-1. Much louder than factory where you want it without being too loud, no drone, and an exhaust system that retains the valve control (because sometimes cruising in comfort with a quiet cabin is soothing).

I think in total with the lift was about 2 hours for install, taking my time. Future exhaust drops for the downpipe swap I did in about 45 minutes (got the hang of things after a few removals when I found oil leak at turbo). First suggestion is remove the intake box in the engine bay. You can reach down and undo the clamp on the turbo/downpipe from there, as well as the 2 bolts that hold the downpipe in place. You have to disconnect the O2 sensors anyways before dropping the downpipe so you’ll already be in the engine bay. NOTE: the O2 clips are held in place with hidden clips. A flat head on the underside will push the clip to the side so the clip can slide off the rail. Those are things I didn’t include in my Remus install guide because that’s more for the downpipe install.

Here’s my detailed Remus exhaust install guide. Hope it helps give you an idea for the install process: https://www.2addicts.com/forums/show....php?t=1360037

Thanks for clearing everything up for me Joe! I really appreciate your thorough replies. Will be looking at going with the CG Precision downpipe and a remus resonated system soon after.

[Joe240]

Originally Posted by kianf22

Thanks for clearing everything up for me Joe! I really appreciate your thorough replies. Will be looking at going with the CG Precision downpipe and a remus resonated system soon after.

My pleasure, glad I could help