I am wanting to run dual cutouts, one from each header but the exhaust shop said there is not enough room.. They said their are screw in headers or something and they said that they would not have much room to work with the y pipe.. I was wondering maybe if i got 2 1/2 inch cutouts that they might go inside the headers. Does anybody run one cut out on each header? I need to know if there is any point in ordering 2.

 

I installed 2 on my truck like you mentioned and it was RIDICULOUS!!! That was with stock manifolds!!! It did sound bad ***, but when it got up to 45 mph, the noise was horrendous and the floor boards felt like they were going to blow up. Needless to say, it was a waste of $200.

IMO, just do like most and put only one cutout after the y-pipe and before the muffler. Plenty loud, easily accessible and that's all you need.

 

I agree.
I also moved this to the GM exhaust section!