Ditch your stock Caliber SRT-4 wastegate actuator for a high pressure adjustable AGP billet aluminum unit. This replaces the factory installed piece, and will allow you to hold higher boost pressures to redline.

Because the AGP Wastegate Actuator has a higher base spring rate, it allows the turbo to push higher, more stable boost. This actuator will help eliminate the boost oscillation that is caused by the stock weak actuator. Additionally, all AGP wastegate actuators are easily adjustable. You don't need to remove the actual rod end from the turbo in order to adjust preload (like you do on other brands). All you need to do is loosen the jamb nut, then turn the entire rod with the adjustment nut. It's very simple.

Installed in the AGP wastegate is a 8 lb spring, and inside the box are two extra springs. The extra springs are a 12 lb spring and a 19 lb spring. Use the 8 lb spring if you want to use the factory controlled boost, or the Diablosport tuner. If you want to bypass the factory controlled boost and do not have the Diablosport, then use the 12 lb spring. We do not recommend using the 19 lb spring unless you are using the AEM FIC, because the pcm closes the throttle once you go much higher than 16 psi, and so no matter what boost you are at above 16 or so, the pcm will close the throttle and you will not make more power. If you want to NOT HAVE pcm control, we recommend the 12 lb spring and adjust it so that you run 15-16 psi.

Colors and pressures of springs:

Note: From around 2005 to around 2015, AGP engraved their logo onto the wastegate body. That was discontinued sometime around 2015, and they are shipping the wastegate without the engraving now.

Note: To see the full benefits of the AGP Wastegate Actuator, we highly recommend purchasing a DiabloSport tuner because the stock PCM will not allow more than 13-14 psi.