On Friday as long as everything goes as planned, I am getting a local tuner to do trifecta stage 3. My car is gm stage 2 with 77.9 pulley and injen intake, that's all. Do I need to pulley down at all? Can I without cooling or exhaust?

 

Not if youre getting the GM Stage 3 setup custom tuned by Trifecta. You can run any pulley size you desire. The GMS3 PCM/tune as it comes from GM is calibrated for the 76 mm (2.99") pulley. I suggest the GMS3 pulley over the GMS2 pulley though. You will make a little more power with it

*I recommend you get some cooling & exhaust mods though. The GMS3 tune benefits from a high flow exhaust setup, and having a cool intake charge is always a plus as well !

 

Ah that's what I figured. I'm gonna get the tune done, but the dual pass and exhaust will have to wait till next paycheque as I am getting new pirellis this paycheque as well. I'm not gonna do any wot runs till cooling mods next week. Thanks

 

No prob !!! Enjoy your GM Stage 3 + Trifecta tune .... I love mine

 

Yea I really can't wait to get it. I'm looking for a 2.9er right now. Will any 2.9 pulley bolt onto my stg 2 hub? Oh one more question, should I run 1 step colder plugs?

 

ZZP sells pulleys that work using the gm stage to hub, http://zzperformance.com/cobalt_ion/...=613&catid=142

 

^^^good link, thankyou!

 

No problem, I actually just got mine in the mail

 

Just make sure to get a 4-bolt pulley for the GMS2 hub, and you should be fine. Nate at Smoothflow makes the best custom pulleys around. He made my 74 mm pulley, and I love it !!

 

Yeah I'm torn on the nates and zzp but that pulley looks real nice. Thanks for your help!