headers, pully drop, pcm order of operations???

**drewzilla03** · 07-17-2011

i am new to the site and new to my 2007 grand prix gt. i have already installed an open cone intake and a 180 t-stat. my headers will be here on tues and i'm wondering if i need to do a pcm immidiately or if i can wait untill i drop the pully? also i've heard that the 07 pcm is difficult...do i need to buy a new one from zzp or overkill or can i look locally for one from a different year GP to tune? with these mods is a drop to 3.4" appropriate?

i am new to mods and the last thing i want to do is mess up my daily driver.
i would grately appreciate any help.
thanks!

**nawarkk** · 07-17-2011

You should install the Tune when you install the Pulley

You can drive around with a stock tune when you have headers/intake.

**JoRoW99** · 07-17-2011

Since you have the newer gen V supercharger you may not be able to drop to a 3.4 pulley. Your supercharger is more efficient so you only need a 3.5 or 3.6. How are you planning on tuning it? if its at a local shop or a friend is doing it, you need a different year PCM. otherwise you can order one from ZZP ect and be fine.

**drewzilla03** · 07-18-2011

a friend is gonna tune...do i get a 04 or 05???gt?gtp? does it matter?

**JoRoW99** · 07-18-2011

GTP because the GT isnt supercharged that year. your gas gauge may also be messed up. Search some more.

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