jBaby3000

I was just wondering how much hp and torque i would make on my 2003 mach 1 with slp longtubes and slp x pipe with cats or should i go without the cats? ty

boss281

id say about 20hp? and cats only make 1-2 hp difference

jBaby3000

Are you serious. Thats kinda dissapointing, i thought the 4v reacted to mods allot better.

wwmost

thats alot. what did you expect? a 100 hp gain?

MCanavan6

20 hp is a lot and if you do things like CAI, throttle body and plenum you will notice a big difference. Dont forget the cat-back.

boss281

yeah man thats about as good as it gets for NA motors for upgrade gains

svt99redcobra

Yea well 20 is alot but if you get the rest of the bolt on's it makes the exhaust create more hp. So if the cai gets you 10, the throttle body gets you 8, the cat back gets you 15, then the headers and x pipe gives you 20. You'll end up with 75hp instead of 53hp you get were im coming from. All the hp numbers are just thearetical numbers i made up for an example.

jBaby3000

Ya im 18 and just to a huge blow trading in my manual Cady CTS on a mach 1, so im strapped for cash. I just want a na car that has around 325 to the rear wheels with just bolt ons and seeing that my money income is negative cause schools espensive...doesnt look like im gonna get ther anytime soon

MCanavan6

325 rwhp might be impossible without heads and cams. I am almost positive you can't get there with just exhaust, cai, tb, plenum, etc.

Machwon

with my old 03 mach I went from 287rwhp (catback/intake) to 302rwhp with longtubes, O/R X and catback. They were the BBK headers. Definetly a worthwhile mod- just for the sound difference alone.