Granatelli 540259 Features:

• True 60 mm valve diameter for maximum exhaust flow
• Water-cooled diaphragm housing for unmatched thermal stability
• Precise, consistent boost control under extreme conditions
• Black anodized billet aluminum top cap for durability and a stealth finish
• Heavy-duty stainless-steel base with natural finish
• Includes V-Band inlet/outlet flanges and clamps
• Five-spring kit included

The Ultimate Boost Control Solution:

If you demand power, predictability, and hardware that stays locked inunder brutal heat, this is your wastegate. Built for racers andhigh-performance street builds, Granatelli’s water-cooled diaphragm wastegatedelivers when controlling boost isn’t optional—it’s mission-critical.

Engineered for superiorstability, cooler operation, and precise boost control:

When you're pushing serious boost, heat becomes yourbiggest enemy. Granatelli’s water-cooled diaphragm wastegate eliminates thatweakness by circulating coolant through the diaphragm housing, keepingtemperatures 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 and high-performance street use,this 44 mm wastegate delivers the reliability and precision your build deserves.

Water-Cooled Diaphragm Advantage:

Traditional wastegates struggle as temperatures climb. Thiswater-cooled diaphragm system stays thermally stable under extreme exhaustheat, giving you: Consistent boost control on hot laps,  More accurate boost regulation,  Longer diaphragm life,  Reduced boost creep in high-heat environments.

A black anodized billet aluminum cap and a natural-finishstainless steel base complete a design built to take abuse without missing abeat.

Straightforward Installation & Full Adjustability:

Installation is simple with the included V-Band inlet andoutlet flanges and clamps. Wastegate includes inlet and outlet flanges with clamps anda spring kit. The spring kit contains five springs: One inner spring, 5.7 psi(30 mm dia. X 64 mm tall), and an outer spring, 4.0 psi (38 mm dia. X 64 mm tall)installed. Three additional springs are included, Red is 4.5 psi (28 mm dia. X60 mm tall), Yellow/Orange is 12 psi (48 mm dia. X 100 mm tall) and a Greenspring, 6.5 psi (58 mm dia. X 78 mm tall). These can be can combined for thedesired boost levels. Also includes water line fittings.

Emissions Note:

This part is only legal for sale and use on Uncontrolled (Non-Emissions Controlled) Vehicles or on vehicles used solely for the purposes of closed competition racing.

CLICK THIS LINK FOR IMPORTANT CARB & EPA EMISSIONS INFORMATION ABOUT THIS PART