what size muffler should i get a 4 in or a 4.5 in and will i really hear a difference? btw i own a 92 acura legend ls and this is the link to the muffler i might buy theres obviously 2 sizes: http://cgi.ebay.com/ebaymotors/Acura-Integra-RSX-CL-TSX-Legend-4-Tip-Carbon-Muffler_W0QQcmdZViewItemQQ_trksidZp3286Q2ec0Q2em14QQhashZitem4147899017QQitemZ280373071895QQptZMotorsQ5fCarQ5fTruckQ5fPartsQ5fAccessories