ZZPerformance

This is a replacement donut gasket for your Series II and Series III 3800. This gasket goes in between the exhaust manifold and crossover pipe. Onl...

The ZZP fuel pump rewire kit was designed to replace the anemic stock 18 gauge wiring. Most GTPs are losing between 1.5 and 2 volts to the stock pu...

The aluminum intake gasket set is a revised higher quality, longer lasting part recommended to replace the factory plastic gasket found in the Seri...

This is a replacement set of O-rings for our ZZP 3800 intercooler system. These are for our updated short stack and Stage 2.5 intercooler core that...

This product is for customers that have already purchased our ZZP 3800 1.0 pcm and need a basic file update.  For example, you changed your injecto...

Description   Includes: K&N drop in air filter ZZP 1.0 pcm 3.5" Modular pulley system ('04+ Grand Prix only comes without a pulley or belt, Bo...

This is a pre-prepared mod package specific to your car that will give you about 35 horsepower. It comes with all of the basic bolt os that allow y...

This 3 inch metal gasket mates the stock rear exhaust manifold to the downpipe.   When installing, the side with the rings faces toward the exhaust...

These are stainless socket cap replacement bolts for your M90 supercharger. Make sure to select the intercooler thickness that you have or just sel...

Greatly increases belt wrap when switching to a smaller pulley. If you are going to run a smaller supercharger pulley sometimes it makes more sense...

Kit contains the following: Modified brass T for connection at the oil neck Steel 90 degree -4 fitting 54" braided steel -4 oil line Steel 90 degr...

Update June 2021: We are proud to announce our new and improved modified steel retainers. These retainers have the weight of titanium but the stren...

This is sold so you can slide it into our 4" intake tubing and then slide a 4" inlet air filter onto the other side. OD is 4.01”ID is 3.75”Thicknes...

The stock reverse lights are 32 candlepower leaving you with a difficult time seeing at night when you have tinted windows. These 40 candlepower po...

These genuine Bosch 42# "Green Giant" injectors are a direct fit for upgrading your 97-03 3800. They have an EV1 connector and come with new inject...

4t65e 2nd Clutch Piston for 4t65e transmission

3rd clutch piston for the 4t65e transmission.

This is our aluminum version of the stock 4T65E transmission pan. It will cool the transmission fluid in a safe way that doesn't require modifying ...

Bushing kit for the 4T65E transmission.

ZZPerformance was the first to break a pump shaft and we are proud to be the first to do something about it. Since we have learned that transmissio...

4T65E "high energy" coast band for the 4T65E/4T60 transmission.

4T65E "high energy" forward band for the 4T65E transmission.

Input clutch piston for the 4t65e transmission

4T65E input speed sensor for the 4T65E transmission.