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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Mods this week - exhaust



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      12-03-2012, 01:25 PM   #1
demontwinz
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Mods this week - exhaust

Hi,

E92 335i

JB4 - I Run map 1 and map 5 only
DCI
ETS - FMIC

I am adding Riss Racing Downpipes for a good price in Toronto.

I am running stock exhaust because I don't want a very loud sound.

I have a source that will sell me Renntech exhaust for a very good price and my shop will install them for free with the downpipes.

Should I get the Renntech exhaust with the RR downpipes or keep the stock exhaust? I want to pass e-mission test in 2 years please.
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      12-03-2012, 01:32 PM   #2
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IF you get catless downpipes, I don't think you'll pass emissions anywhere (not 100% sure about Toronto's stance on removing the cats)
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      12-03-2012, 01:33 PM   #3
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If they do a sniffer test you will not pass with catless downpipes. If they just check OBD II readiness you might be able to get away with it if you use an o2 simulator / downpipe fix.

OR

Just put the stock downpipes back on before testing.
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      12-03-2012, 01:54 PM   #4
demontwinz
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an aftermarket exhaust is only for sound? It really doesn't add much HP. I believe 3-8 HP, depending on exhaust?

I have heard stock exhaust with c-less downpipes. I like that sounds. I just got these downpipes for reduce turbo lag and nicer sound.
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      12-03-2012, 01:56 PM   #5
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Quote:
Originally Posted by demontwinz View Post
an aftermarket exhaust is only for sound? It really doesn't add much HP. I believe 3-8 HP, depending on exhaust?
The OEM 335i catback exhaust is good until you get to 500 WHP
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      12-03-2012, 02:15 PM   #6
demontwinz
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I think I am ok. I wont' be doing anymore mods, JB4, DCI, FMIC, DP.

The next mods would be LSD, suspensions which I could not afford.
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      12-03-2012, 02:19 PM   #7
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Catless downpipes increase the sound by quite a bit, especially at WOT. If you don't want something very loud, stick to just the downpipes. I think you'll be happy with the sound.
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      12-03-2012, 02:24 PM   #8
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Will I be FBO? I search it several times and everyone says different things.

Does WOT mean aggressive driving? I also googled it but I couldn't find anything.


sorry... stupid questions i know.
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      12-03-2012, 02:29 PM   #9
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Quote:
Originally Posted by demontwinz View Post
Will I be FBO? I search it several times and everyone says different things.

Does WOT mean aggressive driving? I also googled it but I couldn't find anything.


sorry... stupid questions i know.
FBO is, in my opinion, downpipes, intercooler, exhaust & intake.

WOT = wide open throttle
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      12-03-2012, 05:27 PM   #10
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If you don't want that louder sound, don't go for cat less DP's...

I would say catted downpipes, but then again, if your looking for power, cat less is the way forward tbh.

Stock OEM muffler is perfectly fine as mentioned till you get to high HP.
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      12-03-2012, 08:22 PM   #11
demontwinz
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I like the catless DP. I am ok with that sound.

I dont' think I will put the Rennart exhaust on it because it will be too loud.
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      12-04-2012, 08:52 AM   #12
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imo the stock 335 exhaust sounds too rapsy with catless downpipes.. didnt really like the sound at all , i got rennart exhaust and the sound is perfect now and not much louder than stock but deeper and zero rasp...
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      12-04-2012, 08:56 AM   #13
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Chuck i lov your car. So you have Rennart exhaust with catless DP's?
that will be the set up I can get.

I could stay with stock exhaust with DP's.
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      12-04-2012, 10:52 AM   #14
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yea i have resonated rennart and catless dp, and its just a touch louder than stock in the upper rpms and deeper and a little louder down low... no rasp and quiote when off the gas, its perfect if you want a tame system imo
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