I'm thinking about buying the IPE F1 Exhaust for my 458 Italia. I've heard of people who install part of it, then later add the rest, so I'm thinking of just installing the entire system (Headers + Heat Protector + Cat-bypass Pipe + Valvetronic Muffler + Tips). Seems to be one of the loudest, but best sounding exhausts for the 458 Italia I've heard, and I do like the ability to open and close the valves to control the sound volume. I'm in California and assume people who add this F1 Exhaust set-up, remove it later and replace with the factory exhaust if they want to sell the car, since it won't pass the smog test with the F1 Exhaust. A couple questions: 1.Are most IPE F1 Exhaust owners happy with it? 2. Seems to be about $7,200 new on Ebay for parts. I'm not in a hurry, so should I wait to see if I can find a used F1 Exhaust system from someone selling their 458 Italia?