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Here i m using Shell V-Power, should be 97RON i think. ignition is electronic distributor, with original ignition coil.

i think A15 torque band is more toward low end, and the "efficiency" is not high as well. so i think increasing compression ratio would have help in raising torque and widen torque band, thus increasing hp all round.

porting is to increase high end HP. two of these combine together for drivability and fun