Hey all....UPS just delivered my Dynomax cat today but after I opened the box, something did not look right. Its a "DirectFit" cat for 83-92 camaro/firebird. But, the stock cat (OEM) on my camaro has a body about 18 in long. The Direct Fit cat I got only measures about 10 in long. Is it supposed to be this way? What is the difference between longer/shorter cat converters? And finally, should I send it back and order a different one?