The stock compression of the 2JZ-GE VVTi engine is 10.5:1 in the IS300 and GS300. When you boost the stock engine, you are pretty much limited to 7-8psi of boost at the max. You must upgrade to this special ordered Cometic 2.0mm headgasket to lower the compression ratio of the engine to be more boost friendly.
Purchase this together with our ARP Upgraded Head Studs for maximum cylinder head sealing and clamping force.
