Originally Posted by 98SOM_T/A
from a flowmaster muffler?
probably nothing... maybe lose a horsepower or 2..
flowmasters are garbage.
Dude, stop.. you really don't know what your talking about. Flowmasters design is only somewhat mediocre in their fbody mufflers.. the 1 in/2 out shit.
I'd guess 5-10rwhp going to a stock muffler in your car.