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TJay74 · 10-19-2019, 08:27 AM

Yep, catless headers will need a tune no matter what, no if's and's or butt's about that.

Question is if you are going to putt headers and a pulley why wouldnt you want to tune it? The pulley wont do a thing other than bring into boost sooner, if you dont tune the car to change when the ECM open or closes the bypass valve all it is going to do is hit max boost sooner in the RPM range and then the ECM is going to open the bypass valve and bleed off the excess boost that the pulley gains you.

If you ware going down the mod route then set aside $1500 and get a proper ECM and TCM tune. It will make a night and day difference in the car.

10-19-2019, 08:27 AM	#6
TJay74 Drives: 17 Camaro SS 1LE & 16 Sierra AT CC Join Date: Nov 2016 Location: Norman, OK Posts: 2,424	Yep, catless headers will need a tune no matter what, no if's and's or butt's about that. Question is if you are going to putt headers and a pulley why wouldnt you want to tune it? The pulley wont do a thing other than bring into boost sooner, if you dont tune the car to change when the ECM open or closes the bypass valve all it is going to do is hit max boost sooner in the RPM range and then the ECM is going to open the bypass valve and bleed off the excess boost that the pulley gains you. If you ware going down the mod route then set aside $1500 and get a proper ECM and TCM tune. It will make a night and day difference in the car. __________________ 2019 Corvette Z06 2LZ A8 - Halltech CAI, AWE non-catted X-pipe, Mamo V2 ported TB 592rwhp, bone stock 566rwhp 2017 Camaro SS 1LE - Procharger D1SC w/ Tial 2" BOV & Race intercooler / ARH full length catless headers / Alky meth injection system - 650rwhp on conservative tune SOLD