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2Addicts | BMW 2-Series forum Technical Topics N20 (228i) / B46 (230i) Engine, Transmission, Exhaust, Tuning dual exhaust conversion for 230i

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      07-14-2017, 12:21 PM   #1
boypaulkim
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dual exhaust conversion for 230i

hello friends,

i'm a bit new to exhaust upgrades and have a couple of questions.
I know similar question has been asked here and there but couldn't find helpful answer.

I'm currently thinking to replace my 230i stock exhaust to a either stock M235/M240 or M performance exhaust for M235/M240.

the change would simply be for cosmetic look (dual exhaust look) and sound upgrade. I'm not all that interested in performance gain.

so here goes my question

1) can dual exhaust be installed without cutting my current exhaust pipe? i would like to avoid clamping/welding if possible. and revert to stock if needed.

2) i've heard the diameter of the pipe being different from stock 230i exhaust to dual exhaust from M235/M240. how does this get in the way of installing the exhaust?

3) Will installing stock M235/M240 or M performance exhaust for M235/M240 be compatible and functional with my valve? i do not want any code being thrown after installing the new exhaust.

4) Will the dealer refuse/void warranty even when my current exhaust is swapped to another original BMW part? (stock M235/M240 exhaust or MPE)


thank you in advance for your help!
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      07-16-2017, 10:24 PM   #2
Ace604
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Quote:
Originally Posted by boypaulkim View Post
hello friends,

i'm a bit new to exhaust upgrades and have a couple of questions.
I know similar question has been asked here and there but couldn't find helpful answer.

I'm currently thinking to replace my 230i stock exhaust to a either stock M235/M240 or M performance exhaust for M235/M240.

the change would simply be for cosmetic look (dual exhaust look) and sound upgrade. I'm not all that interested in performance gain.

so here goes my question

1) can dual exhaust be installed without cutting my current exhaust pipe? i would like to avoid clamping/welding if possible. and revert to stock if needed.

2) i've heard the diameter of the pipe being different from stock 230i exhaust to dual exhaust from M235/M240. how does this get in the way of installing the exhaust?

3) Will installing stock M235/M240 or M performance exhaust for M235/M240 be compatible and functional with my valve? i do not want any code being thrown after installing the new exhaust.

4) Will the dealer refuse/void warranty even when my current exhaust is swapped to another original BMW part? (stock M235/M240 exhaust or MPE)


thank you in advance for your help!
1) Not possible since the stock exhaust is 1 piece. You can have it cut in a way that can clamped back in the future.

2) Diameter is slightly different, will need to us an adapter clamp.

3) You should be able to directly plug your exhaust valve cable to the M perf. exhaust. No codes are thrown even if your exhaust valve cable is unplugged.

4) Honestly, there's not much that can go wrong with an exhaust... an axleback at that. The dealer can't void warranty for your whole car if you only changed the exhaust. They can void the coverage of your aftermarket parts or any damage caused by said parts.. but since its a BMW exhaust they should cover any defects of the parts anyways.
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      07-20-2017, 10:45 AM   #3
boypaulkim
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thank you for your response.

will there be any negative effect from swapping the exhaust? (droning, back pressure, etc)
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