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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 > Going to put a 3'' turbo back exhaust on my 335



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      12-04-2006, 10:56 PM   #1
jgannonloans
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Going to put a 3'' turbo back exhaust on my 335

thats right all exhausts so far ar 2.5", we're gonna custom up a 3'' turbo back exhaust, going to use the stock cats if possible too
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      12-05-2006, 12:32 AM   #2
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go for it..
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      12-05-2006, 12:58 AM   #3
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Sounds fun. Are you keeping the stock muffler?

I'm sure the cat restricts a lot of flow. Especially if they remain at 2.5in.
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      12-05-2006, 01:22 AM   #4
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no getting rid of everything probably freeing up a couple 100 pounds too.....if you look under the car the stock cats are about 3'' or so and we're gonna just modify the new exhaust right into the stock cats, im sure that they are just as good as after market high flow cats
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      12-05-2006, 01:24 AM   #5
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So I'm guessing you'll be using a 3" turbo-back for each turbo (meaning two separate pipes) or are you going to merge them into one 3" pipe? Any specific muffler(s)?
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      12-05-2006, 01:34 AM   #6
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yeah two 3'' downpipes from the turbos, i forget the name of the muffler but its good shit stainless and weigh like 8lbs each
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      12-05-2006, 08:28 AM   #7
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Jgannon,

I'm looking into a custom setup as well. I was going to go with Apexi N1s because they offer an exhaust control valve that can be controlled from the drivers seat. (VA has ridiculous exhaust laws, so I could really use the ability to be stealth or speed with the press of a button).

I figure you can help me out on this question. They offer two types. NA with a 2.36inch "inlet" and a a 3.54inch "tip" and a Turbo with a 3inch "inlet" and a 4.53inch "tip"

When they use the words "inlet" and "tip", does "inlet" refer to the diameter of the opening, with "tip" referring to the length of the tail of the muffler?
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      12-05-2006, 10:00 AM   #8
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finally. wanna see what this car is REALLY capable of sounding like
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      12-06-2006, 02:34 AM   #9
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not really sure about that particluar brand, but you can customize any setup just as long as it fits....they way i see it is why not go 3'' if it will fit, faster!!!
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      12-08-2006, 07:59 PM   #10
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burns stainless steal exhuast all custom made 3" turbo back utilizing the stock cats!!!! the mufflers weigh 2lbs a piece!!!
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      12-08-2006, 09:23 PM   #11
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Quote:
Originally Posted by TheAcAvenger
Jgannon,

I'm looking into a custom setup as well. I was going to go with Apexi N1s because they offer an exhaust control valve that can be controlled from the drivers seat. (VA has ridiculous exhaust laws, so I could really use the ability to be stealth or speed with the press of a button).

I figure you can help me out on this question. They offer two types. NA with a 2.36inch "inlet" and a a 3.54inch "tip" and a Turbo with a 3inch "inlet" and a 4.53inch "tip"

When they use the words "inlet" and "tip", does "inlet" refer to the diameter of the opening, with "tip" referring to the length of the tail of the muffler?
The inlet is the portion of the canister in which the piping ill be connected to. So if something has a 2.5 inlet then that is the width of the inlet, meaning you would probably want to run 2.5" piping. The tip is what will be sticking outside of your rear bumper So the bigger the size of the tip then the bigger the two holes in the back.
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      12-08-2006, 09:28 PM   #12
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Glad to see someone is finally going to test out something bigger then a 2.5" system for this car. I'm curious to see if maybe 3" is going to rob some low end power due to the size of those turbos and the amount of exhaust air traveling through the piping. If it does rob power on stock boost levels then maybe a 70mm system would work best.

Have you thought of maybe also trying going from two 3" systems from the cats then joining then into one 3" pipe till the end? This could posile help better the overall flow pressure and show better results if the other system shows losses.

either way top end increase is going to jump very high.
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      12-09-2006, 01:35 PM   #13
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i really don't think that it will loose anything, just my assumption...those S4 guys put 3'' all day long. i thought of doing 2 pipes out of the turbos and joining into one, but i think that 2 separate pipes will flow better. If anyone is interested check out my thread http://www.e90post.com/forums/showthread.php?t=39164 this will be a bad ass system
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      12-14-2006, 04:54 PM   #14
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us evo guys only use 2.75 or 3" anything less would be uncivilized.

but when i get my 335i i'll have to research more on this 2.5 vs 3" thing.
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