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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 > Down-Pipes without Exhaust ?



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      08-15-2007, 10:09 AM   #1
pauly1
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Down-Pipes without Exhaust ?

For those of us who are looking to extract more power, but still keep the car on the quiet side, what are the opinions on Procede + down-pipes..but keep the stock exhaust? Obviously opening up the entire exhasut will yield the most power, but if we're only talking about a loss of no more than 15hp, I can deal with that, (I''ll already be close to 400) if however losses are substantial then I might have to consider a very quiet exhaust. Please only respond if you're familiar with forced induction applications. I'm not interested in hearing, well an exhaust made 25 to 30 hp on this dyno, so therefore you'll come up 25 to hp short, it doesn't work that way. I know enough to understand that addding an an intake, header and exhaust doesn't equal the sum of it's parts. In other words if you pick up Mike picked 5 hp from an intake, John picked up 10 hp from adding a header and steve picked picked up 10 hp from his exhaust...then if I do all 3 I should gain 25 hp total. Wrong!
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      08-15-2007, 10:30 AM   #2
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Downpipes make more sense than cat-back. The noise increases especially by having crappy mufflers typically offered along the cat-backs. Crappy at least in their capability to do their primary job, i.e. decrease the noise.

DPs cost less and keep the noise more bearable. Together with a piggyback you have indeed a lot of power already. At the moment AA is having a map for less back pressure solutions (as with DPs or cat-back). Vishnu should have a specific map to go with DPs later on. All piggybacks work ok with the standard map as well, but by specific "low back-pressure map" you can extract a few more hp.
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      08-15-2007, 12:59 PM   #3
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There have already been a couple of threads on this but I intend to do catless downpipes with an otherwise stock exhaust and V2 and that should net me 400RWHP. No drone...not much louder than stock and you have a pretty much stock sounding 335 that should be very quick.
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      08-15-2007, 01:08 PM   #4
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Quote:
Originally Posted by derryck View Post
There have already been a couple of threads on this but I intend to do catless downpipes with an otherwise stock exhaust and V2 and that should net me 400RWHP. No drone...not much louder than stock and you have a pretty much stock sounding 335 that should be very quick.
But you are forgetting the best part of this set-up. Complete sleeper, none of the mods are visible : ) What someone thinks is 300 HP is really 460 HP.
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      08-15-2007, 01:38 PM   #5
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But you are forgetting the best part of this set-up. Complete sleeper, none of the mods are visible : ) What someone thinks is 300 HP is really 460 HP.
I can tell ur cars reall fast
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      08-15-2007, 01:38 PM   #6
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I'm not forgetting...that's the reason I bought this car. I have a pretty well-modified M3 that's my attention grabber. The 335 is for taking the fellas to lunch and putting a beating on those unsuspecting prey along the way.
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      08-15-2007, 01:56 PM   #7
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I think 400whp is a bit optimistic for some time still.
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      08-15-2007, 01:57 PM   #8
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stealth = +1

Being able to take the car to work in a proffesional environment and still manage kills along the way. Priceless.
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      08-15-2007, 02:52 PM   #9
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I think 400whp is a bit optimistic for some time still.
ya, but it's getting pretty close though. Unless some people still put merit in crank hp, which isn't good for anything, except maybe bragging rights. Then it's easy to achieve.
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      08-15-2007, 03:16 PM   #10
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V 2 should be good for 30 RWHP and catless downpipes for another 25ish RWHP and that puts me over 400 RWHP...shouldn't be a stretch at all.
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      08-15-2007, 03:27 PM   #11
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V 2 should be good for 30 RWHP and catless downpipes for another 25ish RWHP and that puts me over 400 RWHP...shouldn't be a stretch at all.
My car dynos at 340whp with procede and exhaust... So downpipes say another 20 and procede v2.0 another 20 would put you at 380 on the high side... With the FMIC and a map from vishnu for the DP's, exhaust, and FMIC should yeild around 400whp... With a 100 oct map we sould be getting into the 450whp range and 500lb tq...
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