I would think those kinds of gains would be over stock exhaust, but I wasn't sure with the way Mongo's post was worded:
it not only sounds better than the flowmasters I did have, but they flow better as well. I gained about 35-40 horses ......
__________________
2006 Mustang GT
1990 LX
GT-40 motor 262 horsepower, 307ft-lbs (sold but forever loved)
1998 Contour SVT
Rice Haters Club Member #244
|