racer61 Posted May 14, 2007 Report Share Posted May 14, 2007 Im trying to figure out which type of exhaust would be better on a pro late model with a crate engine. A true dual exhaust with dual mufflers? Y-pipe with one muffler? X-pipe dual mufflers? Anyone done any research on this? Anything helps. Cory Quote Link to comment Share on other sites More sharing options...
Truck99 Posted May 14, 2007 Report Share Posted May 14, 2007 With the rough testing we did last year, the Y pipe setup won out over the X. I've also done some reading on the subject, and the Y seems to be the ticket. I've seen a mixture of both on late models at the track, but the Y system is by far the most common. Quote Link to comment Share on other sites More sharing options...
jracer98 Posted May 14, 2007 Report Share Posted May 14, 2007 There are some "crate" forums that you can explore (4M for example). What I wanted to point out to you, in case you didn't know, is that the 604 has raised exhaust ports. "Standard" port headers don't line up correctly and hinder flow. Schoenfeld (and others) list crate headers separately. This is why. Just trying to help. Jay Quote Link to comment Share on other sites More sharing options...
racer61 Posted May 14, 2007 Author Report Share Posted May 14, 2007 thanks ss and jay! I was pretty convinced to go with the Y-pipe setup, but wasnt sure if there was something better. Thanks, Cory Quote Link to comment Share on other sites More sharing options...
xcellracing Posted May 17, 2007 Report Share Posted May 17, 2007 Cory, I dont run a crate but on the dyno the "true" dual exaust you are refering to put out better # than the "Y" pipe or 2 into one did with a flowmaster. On the dual i use the schoenfield 11 or 12 inch IMCA mufflers. I also run a velocity stepped header. Hope this helps Quote Link to comment Share on other sites More sharing options...
racer61 Posted May 20, 2007 Author Report Share Posted May 20, 2007 (edited) Cory, I dont run a crate but on the dyno the "true" dual exaust you are refering to put out better # than the "Y" pipe or 2 into one did with a flowmaster. On the dual i use the schoenfield 11 or 12 inch IMCA mufflers. I also run a velocity stepped header. Hope this helps great now im back to the drawing board your using downward headers though. Crossover headers are more effecient plus the longer tubes change the characteristics of it. But I appreciate you info. Im still trying to get one of these header suppliers to give me some advice besides "buy both and dyno them to see how they perform on your particular application" Yah, that really helps Edited May 20, 2007 by racer61 Quote Link to comment Share on other sites More sharing options...
Pacecar Posted May 24, 2007 Report Share Posted May 24, 2007 11252 Sunco Drive • Rancho Cordova, CA • 95742 916.635.8108 • Toll Free: 888.778.3312 • info@spdexhaust.com • www.spdexhaust.com Call them. You won't find it on their website. Quote Link to comment Share on other sites More sharing options...
KISS_Racing Posted May 25, 2007 Report Share Posted May 25, 2007 Cory, Save yourself time and money. Go with the Schoenfeld up & over with Y-pipe. Our SPEC truck came with them and they ROCK... Quote Link to comment Share on other sites More sharing options...
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