Wildthingbg

Hey there fellow mustangers. This is my first post; i've been reading on here for a while tho. I bought the american thunder exhaust made by flowmaster and installed it yesterday. It sounds very good; but i am having a pretty big problem. It seems that my car in not accelerating as well as it did in the mid to high range rpm's. I called flowmaster and they said that they have never heard of this before. I let a friend drive my car and he noticed it too. What can i do? and what might the problem be?

I also just ordered the de molet intake and i'm going to put it on tonight!!

thanks

02MustangV6DD

Is it 1 muffler? Do you have true dual? Talk to lil roush or cobra they know there **** for that stuff

mvr

exhaust leak?

l_shizzle_l

what size piping did you use for your exhaust?
did you take off the cats?
you could of taken away too much backpressure and that would explain the loss in power.
or sometimes the engine needs to relearn how much air/fuel mixture to use after an exhaust job.