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I have a 7m powered Supra Sports Sedan. I was after some idea's to gain a bit more horsepower?. Rough spec's Garrett T04z Turbo 20psi boost currently makes 538hp at rear wheels. Forged pistons cams custom intake Head work etc Water spray onto intercooler Straight through 4 inch...

Gidday Guys, I have a race car with 7m 540rwhp, with a R154 with Os Giken gear set. I was wondering if anyone makes a lower(shorter) 5th gear to suit. Standard 5th gear is .753, I would like around .85, or lower again if possible. I don't want to lower the diff ratio or tyre/wheel size...