ARC airbox on X
Just curious how you arrived at a single exhaust outperforming a dual on a 4b11 any day? Besides the obvious weight increase of the piping on a dual, if the first half of both exhausts are 3", and the last half is a Dual 2.5" or even Dual 3" versus a Single 3", wouldn't you think the backpressure of the last halves would be very similar on a dual 2.5" or LOWER on a Dual 3" exhaust? You can tune the exhausts for better NA performance but on a Turbocharged car usually just going lowest backpressure will result in the best performance under the curve when comparing them on a Dyno. Even for systems with 2 mufflers, wouldn't there be less backpressure when only half the airflow has to go out of each one? Just something to think about. 
The exhaust isn't outflowing even a single 3" pipe, so there is no added restriction with a single pipe as you are claiming, but the split in the dual system adds unneeded bends and restriction. This is the same principle behind the "JDM" style angled exit exhaust systems ... you eliminate a bend or two that would be needed to make the pipe exit straight out of the back and therefore lower backpressure.
True that makes sense. I guess that Y is a little tighter of a bend then I've seen on the Buschur or ETS dual catback, almost a T actually which I can see reducing some velocity.
Thread
Thread Starter
Forum
Replies
Last Post
fabcas311
The Loft / EvoM Car Talk Corner
33
Sep 11, 2011 09:23 PM
