04 Mustang GT Question?
Originally Posted by KungFuHamster
flowmasters suck
Originally Posted by Soon2BeStangin
On most Mustangs your going to gain 1-5 horsepower with a different muffler. Something Id sacrifice anyday for sound.
Originally Posted by flo w fx
I'd always heard SLP LM's were terrible for gains because they're essentially glasspacks. The most free flowing were Borlas, 2OTL, and Corsa I believe
SLP 2OTL
SLP LM
Borla
Magnaflow
Some others
Flowmaster
i thought SLP LM were good on gains because at WOT it's practically straight pipe.... i could be wrong.







