what exaust and header get the most hp gain..? i was wondering if i could have a custom exaust made..not a cat back..an exaust that has fatter piping that starts at the exaust manifold..can this be made?and is it a good idea to get a grounding system?

 

For exhaust I am planning on having a custom fabricated Y-pipe installed that is 2.5 inches in diameter and then running a single 3.25 inch pipe all the way back replacing the resonator with a Magnaflow muffler and end the pipe on one side only. This will be lighter than a true dual and can provide the same flow. I will leave the cats in to establish some backpressure and to stay legal.