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Old 12-07-2008, 10:53 PM   #1
doogee
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328is Dual to Single Pipe

I bought my 328is with a remus exhaust. I've been wondering for the longest time if the way it was put on would be limiting my power?

Obviously the 328 has dual pipes all the way down but mine is welded into Y-Pipe right before the muffler.

Anyone have any input?
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Old 12-08-2008, 04:40 AM   #2
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I suppose it depends on the radius of that final pipe right before the muffler. If it pushes the same volume of gas through as the 2 individual pipes running to it, then it wouldn't matter. If it's not bigger than the 2 pipes coming in, then you've got a problem.
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Old 12-08-2008, 11:16 AM   #3
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Damn I think It's the same size. I'll have to measure today. I love the sound of it and don't want to have to buy a proper exhaust, but I want to be getting as much power as I can.
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Old 12-08-2008, 12:47 PM   #4
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buddy, your not going to gain anything substaintually in power gains.. however, lie the earlier post if its smaller it may cause too much back pressure.. my 328is had a POS 'Y' pipe. i've since replaced it with an OEM M3 exhaust
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Old 12-08-2008, 12:59 PM   #5
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Well considering someone I know gained 11whp from an aftermarket exhaust on his 325, I would consider it a substantial gain if what I have right now is more restrictive than stock.
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Old 12-08-2008, 01:02 PM   #6
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^^ does the m3 exhaust actually yield noticeable gains in torque and/or hp? Ive read that the m3 exhaust is actually heavier and no gains. Im thinking of keeping the oem muffler and just upsizing the pipes to 2-3/4"-3".
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Old 12-08-2008, 01:06 PM   #7
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From what I have heard, there aren't any gains putting an M3 Exhaust on a 328. Just a deeper sound, and more weight.
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Old 12-08-2008, 10:46 PM   #8
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I have an m3 exhaust in my garage I want to sell. Nice chrome tips : ) PM me if your interested.
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Old 12-09-2008, 03:13 PM   #9
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dude, for the weight of a 328is are you honestly going to feel 11 hp?

yes the M3 exhaust is heavier and sounds deeper, but its quality German steel that wont rot away like aftermarket
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Old 12-16-2008, 05:48 PM   #10
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I'll trade you my stock exhaust if you want, since my stock parts seem to work so well for your car
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