weld in flows

yeah, I have the non-stainless steel version of these clamped (yes, clamped) into the stock system. Sound is awesome; yes, you do get drone but with 4.10s it's not a problem since you are out of the drone zone. And I like the drone!

However, unless you think you can actually buy the mufflers very cheap, I'd go full catback if i had to do it again. Or I'd get these welded in properly! I get a little leakage being that they are clamped into the stock system.
 
Flows sound sweet on any mustang, it really makes the car sound the way that it should have when it left the factory. Just get a catback system though, I think I paid $299 for mine from summit and everything fit great. By the time that you buy both mufflers and have a shop weld them in you will be in the $150+ range anyways. Later.