Cons about 2.5 upper

[n0speedlimit]

alright guys im getting ready to order the 2.5 upper pulley, before i do just want to know if i should be expecting any issues after i do this mod. i am bone stock other than full exhaust and CAI. also the stock injectors should be ok for the pulley swap im guessing? i am also going to put an Elite catch can on at the same time.

[CanadianZL1#992]

A 2.55 will put you at 18% overdriven with stock lower. . Too much for stock injectors.

[ZL1Kid_AL]

it is so much easier to change the lower. Just my .02 cents. Also bigger lowers help with belt wrap and reduce the chance of the belt slipping

Anything over 10% needs new injector

[robrocketanski]

I would only do the upper if you are already planning to disassemble the blower, like to do the isolator or ported snout.

You could do a 5% lower now and when you are ready for injectors do a bigger lower.

Also just my .02 cents

[m1key1111]

The 2.5 upper is a great mod, I did mine because I had to replace the isolater. I have zero belt slip. You will need some injectors though (ID850+).

With Kooks LT (cats), 2.50 pulley, CAI, Injectors mine made 605RWHP / 588RWTQ (SAE) hot with only 20 degrees of timing. It made 15PSI through cats and since then I've removed the cats and it makes 14PSI of boost.

http://m.imgur.com/a/j6Nrs

[n0speedlimit]

Originally Posted by m1key1111

The 2.5 upper is a great mod, I did mine because I had to replace the isolater. I have zero belt slip. You will need some injectors though (ID850+).

With Kooks LT (cats), 2.50 pulley, CAI, Injectors mine made 605RWHP / 588RWTQ (SAE) hot with only 20 degrees of timing. It made 15PSI through cats and since then I've removed the cats and it makes 14PSI of boost.

http://m.imgur.com/a/j6Nrs

im ordering the isolater as well and i am not looking forward to spending $900+ on the ID850 injectors!