Hi, my brother has a 1996 Saleen Clone, and was looking to put some new tips on it...spruce it up a bit. He was thinking of buying Magnaflow 4" Diameter, 2.5" inlet, 18" long tips. Here is a link to it on ebay: http://cgi.ebay.com/ebaymotors/ws/e...3633&item=2471053572&sspagename=STRK:MEBWA:IT . Are any of these measurements no good, or does he get the thumbs up?