I have a question about what exaust setup i should run. I want to keep as much torque as possible but gain hp. Im thinking of keeping the stock manifolds and running a magnaflow cat/y pipe and a single in dual out muffler. My cat is bad for sure i can hear it rattle when i press on the gas. Maybe i should keep it single and just replace the cat with a stock or high flow one and replace the muffler with a better flowing one aswell. Any suggestions? For those of you running the single in, dual out, did you notice any torque loss?