What size y pipe?
Thread Starter
Staging Lane
Joined: Sep 2011
Posts: 58
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From: Northeast Georgia
What size y pipe? My car currently has a 3 inch ORY running though a Borla XR-1 and out the back through a single exit. With its most recent mods, it made 506whp. It a supercharged 383. Would increasing the exhaust size help at this point? When does 3 inch become a restriction? I'm not wanting to go duals.
Thread Starter
Staging Lane
Joined: Sep 2011
Posts: 58
Likes: 0
From: Northeast Georgia
Nah, not mail order. Actual dyno tuning. When you pay for the tuning once, the tune will be tweaked for free if I bring my car in. I'd be terrified running a mail order on this thing. 
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Benny, have you given any thought to selling the current headers you have and stepping up to the larger primaries? I seriously think you'd see a fairly vast improvement with them.
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Staging Lane
Joined: Sep 2011
Posts: 58
Likes: 0
From: Northeast Georgia
I was just thinking about that. I'd like to see what 1 7/8 inch headers and 3 1/2-4 inch exhaust would make. It would be a good little comparison. I may just lose boost and not gain any power.
I'd go with the 4" and run it out the back so you can use a full size muffler in the stock location. Magnaflow #14153 (14" case L), Magnaflow #12594 (22" case L, with dual 3" exits), and the QTP #12400(13.5" case L). FYI the only reason the 4" would be any louder is if the muffler size doesn't increase. If you really want to run smaller than 4" then I'd run a FM3"/4" Y-merger into a 4" cut-out followed by a 4"/3" reducer going into your current 3" cat-back with the Borla XR1, or go with a Magnaflow #12579 (22" case L) if you really want to quiet it down with the cut-out closed. This will allow full flow when the cut-out is open and you're heavy on the GO pedal, but quieter to quiet with it closed.
Thread Starter
Staging Lane
Joined: Sep 2011
Posts: 58
Likes: 0
From: Northeast Georgia
That's a good idea 99bluZ28. The 4 inch dump would open it up but back to quiet with the 3 inch reducer and I don't even have to buy a muffler or all that 4 inch pipe. Nice!
Or since its still loud now, I may would put a 6 inch Dynomax bullet right before the turn down. It would clean up the sound when the dump was open and make it even quieter when it's closed than it is now. Right now the drone is pretty bad, especially with the windows up and t-tops in.
Or since its still loud now, I may would put a 6 inch Dynomax bullet right before the turn down. It would clean up the sound when the dump was open and make it even quieter when it's closed than it is now. Right now the drone is pretty bad, especially with the windows up and t-tops in.
a guy here with a 393 ls1 stroker made 530whp using a y pipe setup and 3.5" catback exhaust with a single muffler on a fd rx7.
i think you guys are underestimating the 3 and 3.5" exhaust capabilities.
m6 car went 136 na btw.
i think you guys are underestimating the 3 and 3.5" exhaust capabilities.
m6 car went 136 na btw.
And he probably would have made more with an X set-up. Nobody is underestimating anything, simply stating an X will outperform a Y.
