Bolt on Horsepower! Grimmspeed STi Thermal Manifold Spacer
Here’s an easy bolt on mod that will instantly increase the STi wheel horsepower! If you don’t know already, the cooler your intake air is the more HP your car will achieve. For every...
Here’s an easy bolt on mod that will instantly increase the STi wheel horsepower! If you don’t know already, the cooler your intake air is the more HP your car will achieve. For every...
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