Cobalt-Addiction
This 2.79" pulley will fit the GM Stage 2 hub - It is made out of 6061 Billet Aluminum and Hard Anodized for wear resistance - There is 77.9 MM engraved on the face making it look like the stock 3" GM Pulley - It is CNC machine to 0.001" accuracy and designed to withstand high RPM - The side walls of the pulley are 77.9MM or 3” in diameter - The top of the groove has a diameter of 2.79” . These have been proven to run great on the GM stage 2 reflash as it is very rich fuel wise to start with and this will bring you right into the correct AFR . Will bump you up to 17.5psi !!!!!

I'm getting stage 2 installed next Fri and just going ahead and getting the 2.9 on. I have heard alot of people claim 2.9 is as small as you want to go but how can companys back claims like this if it's such a bad idea without a million blown engines/problems on hand?

 

they will tell you anything to get your money...your injectors will hate you if you put that pulley on.

 

I don't plan to. I'm going to get a 2.9 even though I've seen many people run a 2.8 with no problems and a 2.8 isn't that big of a change over a 2.79. I would consider a 2.85 instead though....I live in VA if elevation is important..would a 2.85 be over pushing it? How much does a 2.9 push anyways.. 15-16lbs?

 

if you plain on getting stage 2 dont drop pulley sizes, leave it alone. But if you want to fool around with different pulley sizes just get 60s and save yourself some money, time, and agrivation.

 

03 cobra, yours?