Which y pipe to get??

[sethv]

Hey guys. Converting my truck to a single exhaust so it won't be as loud anymore (Tired of hearing the neighbors complain, and tired of getting pulled over by Johnny Law!!). Anyways, which y pipe do I get??

http://www.summitracing.com/search/M...=walker+y+pipe

The Advance auto website says the Walker 40365 is the only one that will work, but I don't see why the other ones won't?

Which one should I get? Are there any differences in the manifolds that would make them specific, or does it not matter?

Thanks guys.