When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
The stock cats are not that big of a restriction. From what I've read over the years the biggest restrictions in the factory exhaust is the muffler and the manifolds. So replacing if your not planning on doing LT's I would invest the money elsewhere.