Just wanted to let all know. I just had 2.5 in exhaust installed all the way from the 4 into 1 factory header, 2 feet later installed a 22in resonator, and out the back a flowmaster. car sounds deep an not to loud. I dont think performance has been to comprimised. I tryed it without the resonator an it sounded like a indy car but yet legal for streets. thumbs up for the resonator 70 dollars installed. Header back 300.00 for total install.(non epa compliant)