I'm thinking about doing a custom cat-back exhaust but i don't know what would be best for my SE-R. I was thinking of buying a universal N1 or N1 style muffler with a 2.5" inlet and run 2.5" piping from the cat. Is this size piping going to rob me of torque? I hear the Greddy's piping is 60mm which is just about 2.5" if not less and Greddy's exhaust by far the best. Anyone know how it'll sound? Ricey? Nice? Maybe you guys can help me out. I got quoted for a 2.5" custom exhaust from the local muffler shop. They said they'll do it for $120 and thats if i bring them my own muffler. Do you guys think thats too much?