mikemc04gt

A little background...I have a '04 GT that is stock except I had the factory mufflers replaced with Flowmaster 40's. It sounds pretty good, but I want it louder. The car is under warranty so I can't remove the cats. I know the car has a factory H behind the cats, will adding an aftermarket H or X and leaving the rest of exhaust as is make the car obviously louder? I don't really want to install a whole new cat back system at this time.Thanks in advance.

vertmustang98gt

Puttin a h or x pipe on a car will make obviously louder. Although Ford will probably void your warranty unless you know someone that can let you slide by. I wouldn't recommend puttina mid pipe on the car if you want too keep the warranty because you can't leave the stock cats on with thenew pipe. It will make the car sound mean though, an h pipe will give the car a deeper tone with the flowmasters, but if youwant a raspier tone you can go with an x pipe.

MU71L4710N

just put the stock one back on if you ever have to go in for warranty work...its not rocket science.

IanJK46conv

anyone have sound clips of a Pypes catted x pipe and catback? Just got mine in the mail, can't wait til spring to hear it. Also, jba or bbk headers? I'm leaning toward ceramic jba.

rainydayracing

I like the H with flow's, but everyone has their own opinion. Check out the clips, and see what you like the best.

boduke0220

my neighbor has a 99 GT and it has 4 cats on it. they took the 2 front ones off and it sounds MEAN!!! i have flows on mine and so does he and his sounds so much better.
and it will still pass emissions i believe. but that will vid the warrenty

mikemc04gt

Will removing the stock H and cats cause the computer to throw a code or affect the way the car runs or fuel economy?

mvr

yes removing the cats will throw a code from the rear 02's whos job it is to make sure the cats are doing there job. and i ran with that code on for a month, didnt notice any difference accept that freakin anoying engine light. and removing the cats will increase your mpg a tad.

Mustang 03 GT

With Flow's go with the h-pipe. I bought a summit o/r h-pipe with my flowmaster cat back exhuast and it sounds mean!! I also kept my stock mid pipe w/cats just in case I needed it for state inspection.

CarolinaCobras

X pipes.

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