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07-10-2007, 08:09 PM | #1 |
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135i exhaust - true "dual" like 335?
I know it exits on the one side (which I do prefer, looks-wise) but does anyone know yet if the 135 has a separated exhaust like the 335?
my guess is no, but with the same power spec, who knows? I'll even take educated guesses! thanks! |
07-10-2007, 09:08 PM | #2 |
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I was thinking about this as well...
For best clues, we need to see the underside of the new 535, it will tell all... I can't imagine BMW joining the downpipes together, but anything is possible... |
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07-11-2007, 01:12 AM | #3 |
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Ideally it would be one pipe to save weight. Also, one 3.5 inch pipe flows as much as two 2.5 inch pipes. Due to less friction from less surface area. Only one 3.5 inch pipe weighs 40% less, around 20-30lbs'. If it is separate, when I buy my aftermarket tbe, I'll get a single anyway for these reasons.
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07-11-2007, 11:25 AM | #4 |
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Clearly for the parallel turbos to work, it at least needs to be a true dual right at the beginning. The question becomes whether it converges into one pipe or continues as two separate pipes. Im thinking that one pipe would be a cheaper, more compact way of getting the job done.
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07-11-2007, 01:41 PM | #6 | |
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This was done to meet stringent California and now 50 state requirements for emissions. This also means that these cats take a lot of punishment and also reduce performance. Ask me about this, I had to replace one, at considerable expense, since the engine had to be pulled! Example, Euro spec E46 M3s had the cats down stream in the exhaust pipe, giving the Euro spec E46 M3 a little more performance versus the NA spec E46 M3, which had cats in the exhaust manifolds. |
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07-11-2007, 06:20 PM | #7 | |
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good call on the weight issue.....had not thought about that! (and i am almost always thinking about that!) of course, it may be easier to route two smaller pipes side by side (thinking of the 3.5" pipe dia...)
Not sure how the 535i exhaust will give us clues... that is even bigger (more room for pipes) than the 335. Please explain - thanks! -jac Quote:
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07-11-2007, 11:36 PM | #9 |
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07-12-2007, 02:13 PM | #10 | |
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Hey Wiggum I see you are over here from the MS6 forum as well
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2006 Mazdaspeed 6 - Liquid Platinum
1999 Jeep Cherokee Sport - 4 Door 5-speed Red |
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07-15-2007, 08:23 PM | #13 |
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08-14-2007, 10:22 AM | #14 |
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So that is what those swellings are in the headers. Would the engine also have to be pulled to work on the turbos in the same area?
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08-16-2007, 03:25 PM | #15 | |
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In response to the 3.5" pipe comment, thats overkill for most of us. Assuming your turbos can even flow that much CFM your gonna have clearance issues with the exhaust tunnel and the reduced ground clearance. A 3" pipe can handle 500+hp. |
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