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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 > Downpipes & "noise"



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      01-12-2013, 12:17 PM   #23
dlbrooks18
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Quote:
Originally Posted by E90Company View Post
What I like the most about downpipes is the turbo spool
+1 and added power, I even have stock intake with drop in filter and my stock turbos spool loudly and freely.
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      01-12-2013, 12:26 PM   #24
got da booze
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He's right on par with this. The catted ARs are nice but will eventually throw a CEL light at the post cat O2 sensors. You'll want a tune that can auto-clear or get a BT tool for this. Just something to throw out there.

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Originally Posted by jyeah View Post
I was very much in your same shoes and I did a lot of research before I bought my AR catted DP. I didn't want the car to sound louder and prefer it to be stock quiet (I had the BMW PE before and sold it because it was too loud and droned).

So to answer your question, it's safe to say there's no way to get the performance of an aftermarket DP, without an increase in the sound level.

Here are some thoughts:
Cons:
1. More likely than not, you will hear wastegate rattle (especially at cold starts, you might even get a few glances at your car from other people), this is the sound that bothers me the most
2. Your exhaust sounds will be louder even with a catted DP (if you're really sensitive to sounds, you will definitely notice), but it's fairly tame
3. Any problem you experience with the turbos will be blamed at your DP by the dealership (since turbos are covered to 8 years/82,000 miles)
4. More likely than not, you will smell unburnt fuel at stops
5. SES light may appear

Pros:
1. More HP
2. Less turbo lag
3. More HP potential with tunes

I'm really happy with my AR catted DP, except for point 1, 4, and 5 in my cons list. Hopefully, I can get rid of these issues with my next upgrade and fix.
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      01-12-2013, 12:47 PM   #25
quasitime
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Those are pretty much perfect. I would jump on them but they are just out of my budget.
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      01-12-2013, 09:22 PM   #26
Envuks
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Quote:
Originally Posted by jyeah
I was very much in your same shoes and I did a lot of research before I bought my AR catted DP. I didn't want the car to sound louder and prefer it to be stock quiet (I had the BMW PE before and sold it because it was too loud and droned).

So to answer your question, it's safe to say there's no way to get the performance of an aftermarket DP, without an increase in the sound level.

Here are some thoughts:
Cons:
1. More likely than not, you will hear wastegate rattle (especially at cold starts, you might even get a few glances at your car from other people), this is the sound that bothers me the most
2. Your exhaust sounds will be louder even with a catted DP (if you're really sensitive to sounds, you will definitely notice), but it's fairly tame
3. Any problem you experience with the turbos will be blamed at your DP by the dealership (since turbos are covered to 8 years/82,000 miles)
4. More likely than not, you will smell unburnt fuel at stops
5. SES light may appear

Pros:
1. More HP
2. Less turbo lag
3. More HP potential with tunes

I'm really happy with my AR catted DP, except for point 1, 4, and 5 in my cons list. Hopefully, I can get rid of these issues with my next upgrade and fix.
Another pro is that they should be good for your turbos because there is less back pressure.
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      01-12-2013, 09:29 PM   #27
dfjaws
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Thought I'd chime in... I have no smell after the secondary cats are warm. None at all. YMMV
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      01-12-2013, 09:35 PM   #28
quasitime
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Wonder why the smell is so YMMV. Could just be a sensitivity thing?
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