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Old 07-18-2009, 10:01 PM   #1
ACS_DAN
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Single Exhaust from the down pipe

I have to get a new exhaust made, the systems I have laying around have resonators that are going to develop holes in no time and mufflers that will essentially have that same problem as well.

So I've come to the point where I want something new made, I cut the down pipe right before it splits into two to go to the flange to the cats.

So I'm trying to figure out, what would be a suitable size of muffler piping all the way back in order to let the car breathe adequately. Stock is 2.25 I believe on each pipe and so he next thing up would be 2.5 as I would tend to think 2.5 would be a bit too small to run a single pipe all the way back?

2.75 I think would be getting a bit excessive but I'm asking for opinions so please share some insight, the motor is a stock m50b25.

I'm also looking at picking up a good size resonator as well any suggestions on that I've found one at 16" that would suit my application but if any of you guys have done the same and found it excessively loud please speak out.

Some extra info that may help, I plan on using a Cat and a muffler in this system as well, so nothing will really be missing from this setup except that it will be single instead of dual.

Thanks
-Dan
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Last edited by ACS_DAN; 07-18-2009 at 10:03 PM.
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Old 07-19-2009, 01:20 AM   #2
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is that going to work? do you not need the proper back pressure from the two sizes? or are you going to re tune the engine? from my understand with exhaust,and than bimmers with the balancer's, that the exhaust provided the proper back pressure, so most people go bigger, or open up the cats. if ur minimizing it to 1 exhaust at only 1/4 inch wider in diameter that may not add enough back pressure?
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Old 07-19-2009, 07:16 AM   #3
Dr. Flyview
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^^? Huh? A smaller exhaust will add more backpressure... So if his "single" exhaust is in effect, too small, he would have too much backpressure.

Sorry I don't have much to add to the original question but I don't really understand why you want to do a single exhaust back. P.S. What exhaust system are you running now and are you getting rid of it?
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Old 07-19-2009, 11:41 AM   #4
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No problem, widening up the pipe by a quarter of an inch is not really a miniscule difference when it comes to piping, I'm not running a Turbo so I don't think there is a need for excessively large piping but, hey lets see what more people say.

I cut the down pipe right before it splits into two before the cats because those flange bolts were ****ed.

So during the swap some parts got lost, that piece being one of them. So I'm looking at the rest of my exhaust system (stock 17 year old Cat back, it's stock by the way. off my touring) It is looking pretty tired, so I'm thinking I might just re-do the whole thing.
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Old 07-20-2009, 04:13 AM   #5
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Quote:
Originally Posted by Dr. Flyview View Post
^^? Huh? A smaller exhaust will add more backpressure... So if his "single" exhaust is in effect, too small, he would have too much backpressure.

Sorry I don't have much to add to the original question but I don't really understand why you want to do a single exhaust back. P.S. What exhaust system are you running now and are you getting rid of it?
yeah that is right, i do not know what i was thinking,lol. well that made me look an idiot. lol.

(i saw civic today at work driving along wilson ave and keele and i guess he punched it while i was looking out at the road, and i thought a bomb exploded and fire came out his exhaust lol.)
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Old 07-20-2009, 11:19 AM   #6
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^^ lol
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