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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N55 Turbo Engine Tuning and Exhaust Modifications - 335i Tuning > Catted DP/Exhaust Options



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      09-29-2012, 10:40 AM   #23
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OP, I would just get a catless downpipe with the stock exhaust. This setup sounds great on the N55, and isn't overbearingly loud. It will give you the most performance, and you will hear the turbo spool much more. If you want a tad more sound, unplug the actuator in the trunk to open both mufflers at low RPM.
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      09-29-2012, 10:52 AM   #24
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Originally Posted by E90Company View Post
OP, I would just get a catless downpipe with the stock exhaust. This setup sounds great on the N55, and isn't overbearingly loud. It will give you the most performance, and you will hear the turbo spool much more. If you want a tad more sound, unplug the actuator in the trunk to open both mufflers at low RPM.
That doesn't solve the problem OP has...

He wants some more Performance, a sportier Sound and all that without the fear of being off warrenty...

That's actually that what i want too... And i already have the PPK and PE...
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      09-29-2012, 10:56 AM   #25
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That doesn't solve the problem OP has...

He wants some more Performance, a sportier Sound and all that without the fear of being off warrenty...

That's actually that what i want too... And i already have the PPK and PE...
Yes, but he has to remember changing the downpipe to anything aftermarket, catted or not, will void the warranty. You are messing with emissions equipment, and the dealership could bring up backpressure/O2 issues/etc if you modify it. So I would say BMW PE with stock DP (Safe route with warranty, less performance, more sound), or C-Less downpipe stock exhaust (Quieter, more performance, warranty void).
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      09-29-2012, 12:34 PM   #26
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I agree with him ^.....you gotta pay to play!
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      09-30-2012, 09:01 AM   #27
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Originally Posted by E90Company View Post
Yes, but he has to remember changing the downpipe to anything aftermarket, catted or not, will void the warranty. You are messing with emissions equipment, and the dealership could bring up backpressure/O2 issues/etc if you modify it. So I would say BMW PE with stock DP (Safe route with warranty, less performance, more sound), or C-Less downpipe stock exhaust (Quieter, more performance, warranty void).
Good points, thanks. What do you have on your car? I may just get the PE for now and enjoy it. I am less worried about the warranty as I am the potential smell from going cat-less. Which is why I was wondering about better catted DP's, but that does not sound like it is worth the money. The BMS DP just seems like too good of a deal for the price if I can put up with the smell.
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      09-30-2012, 09:13 AM   #28
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Good points, thanks. What do you have on your car? I may just get the PE for now and enjoy it. I am less worried about the warranty as I am the potential smell from going cat-less. Which is why I was wondering about better catted DP's, but that does not sound like it is worth the money. The BMS DP just seems like too good of a deal for the price if I can put up with the smell.
My exhaust is completely stock right now, but I plan on getting C-Less downpipes soon. I have an N54 though, which has secondary cats in the midpipes that cuts back on the smell for us. The N55 RWD cars don't have secondary cats, so if you got a C-Less downpipe you would smell it more (nothing to "filter" the exhaust when fully catless).

I agree with you on catted DP's not being worth the money. They are more expensive than a C-Less downpipe, don't provide as much of a gain, and the restriction is still there, along with the other points regarding warranty etc. Not saying it dousn't provide any gains, it's just less of a gain for more money compared to the C-Less option. If I were in your position, I would just get the BMW PE considering you already have the PPK, and you wouldn't have to worry about any warranty issues down the road.
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      09-30-2012, 11:28 AM   #29
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Problem is, catless with PPK will give you warning lights and cat efficiency codes. There is no catless DP "fix" for N55s that I know of.
Homemade, no BMW electric plugs but it works!
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      10-02-2012, 09:37 AM   #30
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I have an AR Design catted downpipe + BMW Performance exhaust for almost a year and I never had any warning lights or whatsoever. Even had a faulty valve been fixed under waranty with the catted downpipe still in place...
But... It is loud, sometimes too loud but I love it.
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      10-02-2012, 09:57 AM   #31
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Here, I will help you..
These are two videos I'll show you with catless downpipe, BMS JB, and aftermarket exhaust.
As you can see, we get a lot of gurgle and pop

First one is AR DP + BMW PE.
Second one is what my car had: BMS DP + AE Exhaust.

Neither of them are for video, just sound. As you can see.




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      10-02-2012, 10:08 AM   #32
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I need to take a video of my car and put it up so you can hear how awesome it sounds. i have AA exhaust with iCabon downpipes.
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      10-05-2012, 01:57 PM   #33
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I need to take a video of my car and put it up so you can hear how awesome it sounds. i have AA exhaust with iCabon downpipes.
I live in Miami, maybe I can check out your car at a meet???
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      10-05-2012, 05:10 PM   #34
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I live in Miami, maybe I can check out your car at a meet???
Yeah man forsure. I go to Ucf but go down to Miami often
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