I am receiving my 500r turbo kit this week and is wanting to know if I should upgrade my exhaust? If so what exhaust? I am currently running the rb duals, no cats just plain straight pipe all the way from the stockers. Thanks

 

I was thinking about going with a 4 inch turboback with two magnagflow mufflers. I think I'll wait and see what goodfellow thinks of his first though.

 

I should have my setup running in a few weeks, I'll try and post sound clips

boostedfd3s, at a minimum I would say get rid of that rb dual if you are worried about restriction. I have an HKS super dragger (3.5 inch piping) catback that I plan on selling for around $100 plus shipping. It's had a lot of the muffling bored out, so it flows well but is loud. cosmetically it's a bit beat up (a few small dents in the can), thus the cheap price. Let me know if you're interested.

 

I like the Apexi GT exhaust, its currently what I run and I think it more than does the job. My current exhaust set-up is 3 inch DP, 3 inch magnaflow MP, 3.5 inch apexi GT cat-back. The only thing I wouldn't do is go from a larger to a smaller diameter somewhere in the exhaust. Some people run a 3.5-4 inch DP to a 3 inch exhaust which to me doesn't make much sense since your IMP creating a bottleneck.

Rich why you doing the 4 inch exhaust, to save some money and do a project/get every HP you can out of a new set-up/combo of both? I'd really like to know if going from a set-up like mine to a full 4 inch would be that beneficial aside from the money saved with making your own. *cough*rich*cough* let me know

 

From speaking to broken09 (who runs full 4 inches to a GT spec muffler) I got the impression that on his 500r setup it made a difference in spool and power. Looking at his 448 at 15 psi dyno chart and the massive low end it had, I decided that I wanted a powerband like his and if he was running a full 4 inch exhaust, then I would too, damnit . I didn't save money having if fabbed up just because 3" dps and mps can be had for next to nothing now. Still, after selling my dp, res mp and pfs catback I was only out of pocket maybe 450 to 500 bucks.

 

i think there was a good write up somewhere concerning 3inch vs 4inch exhaust systems. I think it was in the Yamaguchi (sp?) book. does anyone know what i am talking about?

 

I have that book packed away somewhere.......