Re: Which Flowmasters to get?!?!?! SO CONFUSING!
Most of us with flowmasters probably run the 40 series, that is pretty much the sound you are probably looking for and hear at most shows.
40 series are good, loud, rumbly, they can get old on long trips.
I really like the super 40 series, if I picked flowmaster again, i'd buy those.
I think the standard 40 series are "delta flow"
Spintech is another exhaust you may want to look into, they sound great on big cammed, high hp motors, and on ls motors, search around on youtube and find what your looking for.
Sure flowmaster may be restrictive, but they aren't robbing you of "tons" of hp, you probably wouldn't know (feel) the difference by switching to a better flowing design, though they are out there, better flow generally means louder. With 40 series, those "restrictive" mufflers don't stop me from getting zero traction with a high strung 327.
The only Mustang I'd ever own is a Fender.
'68 333" Camaro
'14 5.0 Mustang