Will these work with my Magnaflow Catback on my 03 GT. I see I will save about 160 bucks over the Magnaflows high flow cats. But I also see that the SLP's are alot smalled than the Magnaflows cats, or should I stay with the same brand.

http://www.americanmuscle.com/slpxc99.html

 

Should fit fine

 

+1 You can use just about any aftermarket x pipe as long as its for short/stock headers. Unless you have long tubes oviously.

 

yea, they should be totally fine

 

OK, On the Amercan Muscle site it says that the Magnaflow Tru-X X-Pipe (Catted, 99-04 GT and Cobra). Why does it say X X for the Magnaflows and only one X for the SLP's. And would anyone know whatSLP's setup would sound like with my Magnaflow catbacks, and will it enprove gas mileage.

 

brand doesnt make a real difference in the sound if its the same diameter. Wont help mpg cause you'll want to hear that wonder sound it makes at higher rpms