Re: Power mods for the I-5
The limiting variable for drivetrain life is torque, not horsepower. Keeping that in mind, the torque drops off from the peak about 20%, so that is your opportunity. You can forget about all those air filters, and exhaust systems. You won't get 20% with those. I'd suggest you look into what people do who race this engine. The first place I would look for more power would be porting the heads, and putting in bigger valves. Then I would be looking at the intake manifold. I would shorten the runners for tuning at a higher RPM, and port it for better airflow. The other place would be the exhaust manifold, and replacing it with tubular headers. This is a touchy area though, because there is a close couple catalytic converter.
Michael
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