X-Pipe ????

are you all talking about stock to a off road X ? cuz mine was like night and day in the HP zone ! the only mod i have done to get a "big" "o hell this was a good mod " reaction from my self...

StangPro said:

There's about zero difference in power on a NA car, and cars with cats sound and smell better.

Click to expand...

I actually gained a substantial amount of hp from my x pipe. I dunno how.
Oh, and I have the off-road, and I love the smell a lot better (it is all based on preference) and I love the hallow sound of the exhaust (again, preference).

Most people will tell you to just get exhaust depending on your sound preference:

If you like a hallow ripping sound, get an O/R X. /* some people say it's a bit raspy with 2 chamber mufflers, but I don't know what they're talking about...I thought that's how Mustangs are supposed to sound */
If you like a solid ripping sound, get an X.
If you like a hallow rumbling sound, get an O/R H.
If you like a solid rumbling sound, get an H.
If you like a hallow mix between the two, get a O/R ProChamber.
If you like a solid mix between the two, get a ProChamber.

If I am wrong on any of these, someone please correct me.

i am going with a off road x for mine because i like the sound.. and i dont mind the smell.. thats how cars are supposed too smell.. but a good set of aftermarket high flow cats will loose hardly any HP over a off road peice...

From those that have taken the time to really try and measure HP gain, loss and shift, the difference is maybe 5 HP more. As someone already said, there are too many vairables. For you, an O/R X may do better, because you already have a chip and can take the car back in to be re-tuned so it's not pig rich at idle.

There will probably never be a real answer to this; too much money to prove or disprove. You'd need a 96-98 Mustang, a 99-01, and a 02-04, all stock, and all automatics for consistency. Then you'd need to baseline each on a 1/4 mile. After the baseline runs, start swapping exhaust systems, and re-run each under virtually identical weather conditions. Mathmatically, the combinations of midpipes and catbacks would be mind numbing. But, that would be real-world results; not what a dyno indicates. Dyno's are a great tuning and test tool, but we don't drive our 'Stang on rollers; we drive them in the real world.

Jerry