When you're pushing serious boost, heat becomes your biggest enemy. Granatelli’s water-cooled diaphragm wastegate eliminates that weakness by circulating coolant through the diaphragm housing, keeping temperatures stable and performance consistent. The result? Harder runs, tighter regulation, and a wastegate that doesn’t flinch when the heat is on.
Designed for drag racing, high-performance street use, and heavy-hitting diesel setups, this 44mm wastegate delivers the reliability and precision your build deserves.
Traditional wastegates struggle as temperatures climb. This water-cooled diaphragm system stays thermally stable under extreme exhaust heat, giving you:
A black anodized billet aluminum cap and a natural-finish stainless steel base complete a design built to take abuse without missing a beat.
Installation is simple with the included V-Band inlet and outlet flanges and clamps. The wastegate comes with two pre-installed springs—4 PSI and 5.7 PSI—giving you a ready-to-run baseline right out of the box. Wastegate includes inlet and outlet flanges with clamps and a spring kit. The spring kit contains five springs: One inner spring 5.7 psi (30mm dia. X 64mm tall) and an outer spring 4.0 psi (38mm dia. X 64mm tall) installed. Three additional springs are included, Red is 4.5 psi (28mm dia. X 60mm tall), Yellow/Orange is 12 psi (48mm dia. X 100mm tall) and a Green spring, 6.5 psi (58mm dia. X 78mm tall). These can be can combined for the desired boost levels. Also includes water line fittings.
The additional springs in the Five-Spring Kit include 4-5 PSI, 6-7 PSI, and 12-13 PSI options. Mix, match, and stack to achieve your exact boost pressure. No guesswork. No compromise.
If you demand power, predictability, and hardware that stays locked in under brutal heat, this is your wastegate. Built for racers, street warriors, and diesel brutes alike, Granatelli’s water-cooled diaphragm wastegate delivers when controlling boost isn’t optional—it’s mission-critical.
