I have a 01 gt with the mods listed in my sig. I'm having my factory tips put back on the car today, and I had the woman at the exhaust shop quote me on a downpipe while I'm there. She said she could install my tips and but a 2.5" dp in for 65 bucks. Trick is that's keeping my stock cat, because she wanted another 240 bucks for a high-flo cat. Is it worth it to upgrade to a 2.5" pipe and keep the stock cat?
seemed like a good price, and I figured I could always replace the cat with a high-flo once this one goes.