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i hane an 04 gt and i got flowmaster and i want to get an x pipe what i want to knw is do cats make a difference. do they add or take away horsepower. what effects do they have on the engine and i also live in baton rouge, la and we have emissions laws down here so i wouldn't be able to legally get an inspection sticker but there are places i can get one at. can anybody help with sum info
If you can get an inspection sticker without the cats, why not? The cats do take power away but around 5-8 hp, maybe more if you have the 6 cat pipe. Just know if you go with the off road X, you pair that with those FMasters, it can get a little raspy. Some like it, some don't but you'll probably have "that" drone anywhere from 1800-2400 when you're at speed.
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MOOG Certified Tech. For mods and sound clips, see profile and gallery.
Ask me why I ran "only" a 13.54.
Member: NMRA Member: White Mustang Registry #362 Member: Fuzzy Dicer
It all depends on what mufflers you have. I have two 2 chambered 40 series, and a BBK no cat X pipe and the car is soo much more responsive, and peppier, not to mention generally faster. You need some semi- restrictive mufflers in order to run no cats. If you have something like SLP loudmouths, which sound like crap anyway in my opinion, then youll loose torque. I love how my car sounds, and everyone says that there is no other mustang around that sounds like it.
I have MAC catless h-pipe with Flowmaster Super 40s. Very nice sound and lots of torque. (I got 10hp/25Tq according to the dyno, from the hpipe alone)
I'm very happy.
Pros - gobs more power, very good sound
Cons, illegal, have swap out for emissions test, your exhaust is a little "stinky."
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-Jim- 2003 Black 10th Anniversary Cobra #353 of 10th Anniversary Editions. Born June 9, 2003
BBK CAI, Magnaflow Catback, MGW Shifter, M/T Drag Radials
I have MAC catless h-pipe with Flowmaster Super 40s. Very nice sound and lots of torque. (I got 10hp/25Tq according to the dyno, from the hpipe alone)
I'm very happy.
Pros - gobs more power, very good sound
Cons, illegal, have swap out for emissions test, your exhaust is a little "stinky."
Yeah its stinky, but im crazy but i love that raw track smelling smell I went from 6 cats to none on my 98 gt. I cant wait to get rid of this cat thats on my car now!
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1998 Mustang GT automatic stock gears, some mods...sold
Best et 14.690@94.37 with a terrible 2.24 60ft
New ride 2000 GTP, gutted air box with K&N, 180 thermo
Best Et 14.57@93.35
*mods after run, Autolite 605s, GMPP STB , MPS 3.7
what are pros and cons of having cats 
I went from 6 cats to none on my 98 gt. I cant wait to get rid of this cat thats on my car now!
