757GT

What do you think about the SLP?

Daniel60

Their isn't any chance of losing performance on the flowmaster is there?

titaniumGT

Whats different about the 2 SLP exhausts? I'm thinking of going with the loudmouth but whats the difference between that and the powerflow axle-back?

757GT

The power flow has small mufflers and the loud mouth for the '05 has nothing. It does not have the resonators they are straight pipes.

titaniumGT

So does the SLP Loudmouth hurt the car any by not having those? Because i'm thinking of going with that and also, what else should i get, like an h or an x pipe.

Daniel60

Hey before you people start installing super audio pipes also remember some will shake your interior unless you enjoy vibration think again.

Hydra8572

The Mustang GT comes stock with an H-Pipe when i had my flowmasters installed the Muffler shop recommended getting an X-Pipe put in at some point.

757GT

Titaniumgt, the loud mouth will not hurt the car it just won't pass emissions tests in certain states. I don't know where you are but in VA where I am that system is illegal.

Daniel60

To whom it may concern I called Flowmaster today and the muffler made for the 2005 GT has been put together, however it has to now be manufactored for sale for the market. They told me the muffler was special made for the car and again told me you will receive more horsepower and better gas mileage.

titaniumGT

What are some good x pipe brands that are out then? I can get passed with emissions (know a guy), but i live in MO not sure how strict they are, haven't really dealt with it before.