[Kwaz1335]

Originally Posted by audiomikej

Background: I currently drive a stock L99. The only upgrade so far is a GMPP axle back exhaust that I got for free. The only fuel available to me is 91 Octane.
I am getting ready to purchase a TVS2300, a cold air intake (either Roto-Fab or ADM), and a tune. Let’s call this Stage 1.
For Stage 2, I want to add LT headers, hi flow cats, and a Fuel pump booster.
When can/should I do the pulley upgrade?
Option #1: Do not upgrade pulley.
Option #2: Upgrade to 3.7” at stage 1, 3.6” at stage 2.
Option #3: Upgrade to 3.6” at stage 1.

What is important to me? Reliability, MPG’s, Acceleration in that order.
Opinions please.

I would recommend upgrading on stage 2..it won't be of much benefit at this point. Remember..long tube headers cause you to lose 2 lbs of boost on average. To correct this..go to the smaller pulley after your lts are installed and get the tune then as well. Save your money and buy it when you need it.