underdrive pullly 3400 belt

[ProjectMM]

just to let everyone know, about the belt needed for th fastfwdperformance underdrive pully is a DAYCO 855k6 from pepboys I couldn't find a GM belt that fits, nor a gaterback. I know this will help at least one person. i had to try 5 different belt to get on right

Ps. it's well worth the money. my 02 GrandAm launches harder, and seems to have a faster topend. haven't beenable to get it to a dyno to see what the real gains are but i pulled away from my friends honda that normally was right on my tail!

[jeremy96gase]

Awesome, I love mine too.
The 3100 belt is # 5060675

[phantom505]

Acutally I'm using a stock belt with mine. I had a 81" Gatorback that fit fine. The tensioner has enough in it use a stocker... (so I found out).

[J.Mo60]

does anyone have evidence on how much an underdrive pulley helps?what kind of improvement have people seen in 1/4 mile times or horsepower ratings? just curious because im lookin into getting the pulley.

[jeremy96gase]

FFP has Dyno's of 8HP to the wheels. Not sure what kinda 1/4 times improvements that is, but my car is definaly more powerful.