I was looking at the Flowmaster 50 series too but decided not to go that route for a couple reasons. For one I couldn't find that the Flowmaster 50 series was made out of stainless steel and I wanted to stick with stainless since I have invested in stainless steel everywhere else, and two because I actually found the The Edelbrock SDT price in stainless steel at $117 shipped where as the cheapest I found the Flowmaster 50 series for was $155 plus S&H.