Question

Ive purchased CAI, y-pipe, Catback and in the process of also purchasing underdrive pullies. I have already put my CAI on and im waiting on the other parts to get here. I want to know if I should also get a CAT too also what size belt should i get for the underdrive pullies. I have already felt a major HP gain from just my CAI alone. How much HP and torque will i get from these bolt-ons (from somone with similar mods and exact numbers from the dyno). Thanks.

about the belts, if ya get on custommaxima.com and go to the page with the pully for sale, there are sizes for the belts. about the cat, u could get a high flow cat and put on there, that would open up the exhaust a lil more

Underdrive pullies?(plural) How many are needed for 2k?

I believe 4 or 5 pullies:confused: :confused:

Originally posted by Ghost24
Ive purchased CAI, y-pipe, Catback and in the process of also purchasing underdrive pullies. I have already put my CAI on and im waiting on the other parts to get here. I want to know if I should also get a CAT too also what size belt should i get for the underdrive pullies. I have already felt a major HP gain from just my CAI alone. How much HP and torque will i get from these bolt-ons (from somone with similar mods and exact numbers from the dyno). Thanks.

Can't really quote dyno numbers but adding UDP will net you no more HP than you are already putting out, it only helps the engine rev faster due to the lighter weights of the pulleys.

Don't be too disappointed on the HP issue though, lighter pulleys do add some hidden benefits such as quicker revving engine and prolongs engine life due less inertia it takes to turn the pulley.
I have no info on belt sizes but do a search on yahoo or google for the belts and maybe you'll come up with some info to share with the rest of us.

Hope this helps

a high flow cat only makes an extra 1 or 2 hp