M235i Straight through exhaust

BMW GENIUS · 06-25-2015, 09:11 AM

Yesterday, a buddy of mine was able to help me put in my catless DP and
JB4, and the results have insane. The install for the downpipe took us about 3 1/2 hours to put everything in since we had to put the car on ramps instead of a lift. Keep in mind, I have a muffler and resonator delete so it is now straight through. First start up after was pretty nice and it is DEFINITELY more vocal yet I thought it was still somewhat tame. Then I had cold start this morning.

Now to give you all an idea as to what to compare the cold start volume with, I also have a LS1 swapped Mazda RX7 FC with a 296/293 cam in it, and I would say it is just about equally as loud on cold start lol. Once the first 30 seconds are done with though, it isn't too bad. On the street driving mildly it isn't too bad as far as volume goes, and believe it or not, it doesn't seem to drone hardly at all. Under WOT, it sounds like it eats small children and pets if they are close by lol. Within the first 2 minutes of driving it on the street after the install, I had 2 cars tell me how great the car sounded, and its hard to disagree with them lol. Ill try and post some videos as soon as I can to give you guys an idea as to what its like!

alexc93 · 06-25-2015, 10:41 AM

I can only imagine....I had straight piped my N55 135i with just a middle resonator and that was insanely loud.

mike@x-ph.com · 06-25-2015, 02:51 PM

Yea it gets really loud with catless downpipe and straight pipes not my choice on a daily driver thats for sure

Jeff@TopGearSolutions · 06-25-2015, 06:03 PM

Most folks don't like these cars with straight pipes, it sounds a bit raw and unrefined.

You're entitled to do what you like and as long as you like it that's all that matters.

Milkee_0923 · 06-27-2015, 06:10 PM

Mind posting a video of your setup. I would like to hear it. Thanks.

BMW GENIUS · 06-28-2015, 07:39 PM

Quote:

Originally Posted by Milkee_0923

Mind posting a video of your setup. I would like to hear it. Thanks.

Yeah I'll go ahead and try and post a video of it all for you!

PeterPure · 07-02-2015, 01:52 AM

Quote:

Originally Posted by Milkee_0923

Mind posting a video of your setup. I would like to hear it. Thanks.

Here is a vid of mine

The exhaust system consists of a wagner decat pipe, stock mid section with resonator and straight pipes (backbox removal).

W/// · 07-09-2015, 08:47 PM

Quote:

Originally Posted by Darkhold

Here is a vid of mine

The exhaust system consists of a wagner decat pipe, stock mid section with resonator and straight pipes (backbox removal).

That surprisingly isn't as loud as I thought it would be. Sounds great though!

PeterPure · 07-10-2015, 02:46 AM

Quote:

Originally Posted by W///

That surprisingly isn't as loud as I thought it would be. Sounds great though!

Yup you can live with it

chaddy74 · 07-10-2015, 03:34 AM

You still running your straight pipe mate ?

Quote:

Originally Posted by Darkhold

Yup you can live with it

PeterPure · 07-10-2015, 03:36 AM

Quote:

Originally Posted by chaddy74

You still running your straight pipe mate ?

Quote:

Originally Posted by Darkhold

Yup you can live with it

Not every day

currently stock box is on.

BMW GENIUS · 07-10-2015, 11:21 AM

I live with mine everyday and I wouldn't say that it's TOO loud other than cold start. Cold start is ridiculous but it's only 30 seconds of my day.

dt20011 · 07-19-2015, 04:01 PM

After a year of straight of having had my muffler removed....I'm ready for a break lol.

BMW GENIUS · 07-20-2015, 08:10 AM

Quote:

Originally Posted by dt20011

After a year of straight of having had my muffler removed....I'm ready for a break lol.

The thing I cant get a break of is the loud crack from the 2nd to 3rd shift!

06-25-2015, 09:11 AM	#1
BMW GENIUS First Lieutenant 153 Rep 397 Posts Drives: 2015 AW M235i 6MT Join Date: Oct 2014 Location: Manly, NSW, Australia iTrader: (0)	M235i Straight through exhaust Yesterday, a buddy of mine was able to help me put in my catless DP and JB4, and the results have insane. The install for the downpipe took us about 3 1/2 hours to put everything in since we had to put the car on ramps instead of a lift. Keep in mind, I have a muffler and resonator delete so it is now straight through. First start up after was pretty nice and it is DEFINITELY more vocal yet I thought it was still somewhat tame. Then I had cold start this morning. Now to give you all an idea as to what to compare the cold start volume with, I also have a LS1 swapped Mazda RX7 FC with a 296/293 cam in it, and I would say it is just about equally as loud on cold start lol. Once the first 30 seconds are done with though, it isn't too bad. On the street driving mildly it isn't too bad as far as volume goes, and believe it or not, it doesn't seem to drone hardly at all. Under WOT, it sounds like it eats small children and pets if they are close by lol. Within the first 2 minutes of driving it on the street after the install, I had 2 cars tell me how great the car sounded, and its hard to disagree with them lol. Ill try and post some videos as soon as I can to give you guys an idea as to what its like!
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06-25-2015, 10:41 AM	#2
alexc93 Colonel 381 Rep 2,384 Posts Drives: na Join Date: Nov 2009 Location: na iTrader: (8)	I can only imagine....I had straight piped my N55 135i with just a middle resonator and that was insanely loud.
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06-25-2015, 02:51 PM	#3
mike@x-ph.com Joint Chiefs of Staff 24188 Rep 190,798 Posts Drives: 07-335/12-328/18-M4/21-M4CP Join Date: Sep 2013 Location: Las Vegas iTrader: (23)	Yea it gets really loud with catless downpipe and straight pipes not my choice on a daily driver thats for sure __________________ Check out our current sale by clicking on this link! https://x-ph.com/sale/ Phone number 702-494-9435
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06-25-2015, 06:03 PM	#4
Jeff@TopGearSolutions 3441 Rep 79,211 Posts Drives: C6 Z06, 09 335i, 10 335xi Join Date: Dec 2008 Location: www.TopGearSolutions.com iTrader: (37)	Most folks don't like these cars with straight pipes, it sounds a bit raw and unrefined. You're entitled to do what you like and as long as you like it that's all that matters.
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06-27-2015, 06:10 PM	#5
Milkee_0923 Private 30 Rep 92 Posts Drives: 2014 BMW M235i Join Date: Mar 2015 Location: Las Vegas, NV iTrader: (0)	Mind posting a video of your setup. I would like to hear it. Thanks.
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07-10-2015, 11:21 AM	#12
BMW GENIUS First Lieutenant 153 Rep 397 Posts Drives: 2015 AW M235i 6MT Join Date: Oct 2014 Location: Manly, NSW, Australia iTrader: (0)	I live with mine everyday and I wouldn't say that it's TOO loud other than cold start. Cold start is ridiculous but it's only 30 seconds of my day.
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07-19-2015, 04:01 PM	#13
dt20011 Lieutenant 262 Rep 528 Posts Drives: 2014 M235i Join Date: May 2014 Location: SoCal iTrader: (0)	After a year of straight of having had my muffler removed....I'm ready for a break lol.
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