I've been toying with the idea of having a custom exhaust put under my car, but not for the same reasons as most. This idea is for my autocross car, and I'm looking to dump some pounds off the car...took the stock Y-pipe and flowmaster catback off today, and it's pretty heavy. So here's my idea: replace the Y-pipe with a catless setup w/ two 2.25-inch pipes into a midmount Magnaflow and a single 2.5-inch pipe out, leading back to exit in the stock location on the driver side (as on the V6 cars). Now contrary to what my profile says, I don't live in CA anymore, so smog testing isn't a problem. Does this sound like a decent setup, or will I just be hemorrhaging power in the name of saving 20-30 pounds? With 145,000 miles on the car, the stock cats are pretty choked up anyway, so let me know what you think.