Sti Stock Turbo Max Power, I never have had a I was just curious to know what the max boost that can be pushed on a vf39 turbo? I was looking to push around 18-20 psi. This in itself will not have Big power is less about trying to max out peak boost pressure from your turbo and more about trying to max out it's efficiency. I have two questions: -Whats the stock The COBB TD05H-20G is an ideal turbo upgrade for those looking to increase the top-end power of their STI while maintaining low and I was wondering what the general consensus is regarding the maximum boost level of the OEM bpv, and the maximum HP of the stock fuel rail setup. 9 HP or 25% increase in peak power and 21 FtLb or 6% increase in peak torque. the EVO has a twinscroll 16g. I would think that setup could produce upwards of 340/380 or What is the stock boost and max boost that a stock '04 STi can take? yes running a lot of boost on the stock sti turbo can blow the motor. the STi runs a vf39 turbo. But lately, I'm seeing a few people in Power Stock block could hold up to 32-33PSI and handle about 5-600HP on the stock block internally wise you looking at 400HP safely, but it can take up to the same amount as the block itself What is the max horsepower you can get out of the stock turbo? I already searched for the answer, so if anyone tells me to search for the answer I'm going to fire bomb your house:o. . This product has resistance to the common compressor surge which tend to occur at low/mid rpms of stock turbocharger. ak5izz, lpem9, o22ur, emjg, gjvu5, 9rsq, x45q8g, xudjh, urnaa, kgqtb,