i know people on the web boosting 12psi with it on their SOHC. just make sure that your engine internals are somewhat strenghtened before pushing anything higher than 8psi, IMO. a rule of thumb: 1 psi boost is equal to 10 +/- 2 HP gain depending on the tuning. i think that the GReddy kit is the best for SOHC application. i havent had any problems with mine since day one, except minor installation discrepancies that i messed up. you'll sure take an I/H/E GSR and Si. peace
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