Quote:
Originally Posted by Dirty Harry
1st dyno pic are “stock” (Mishimoto inlet tube and STI axle back exhaust) runs.
2nd dyno pic is with the HKS GT-Spec catted header installed and a BMC drop in air filter comparing it to stock.
An extra 11.4kW (15hp) at the wheels and more low end torque. If you’re sitting on the fence about getting a header and tune, I’d recommend it.
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That flattened torque curve (+ 25 lb-ft at 4K rpm), I suspect, is the key to your happiness, more so than the 15 hp overall gain.