Thanks for all the comments. I did everything on ehaust bender for now just to see how it works, then i am going to use aluminum mandrel bents pipes. I dualed the exhaust out of 2 1/2, but i think i am going to go back to three on one side. I also have SCT for tunning software. Has any one tuned a turboed chev with SCT?

 

I like it man!! You may see some restriction at the turbo inlet with that size pipe though. I know its hard to get 4" diameter, especially if you have to bend it.
I had a smaller pipe on mine for a couple days and noticed a performance drop.