Re: Which is better?
Flowmaster does have a stainless steel set. I have them installed on my 2010. They were a bit to quiet for me at first but after a couple thousand miles these things roar! I love em. I had a 2004 Mach 1 that I installed a set of SLP longtubes and their catted x-pipe with their loudmouth exhaust. It was just crazy! But I still love SLP. I really like the flows...
1966 Mustang Fastback HiPo 289 full roller, 4-Speed Toploader,9" w/ 3.70's