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The ALTA Drop in filter makes a few extra HP but where it really shines is when it gets dirty
2017+ Audi RS4 B9
Primary Benefit: PERFORMANCE
Free-air calibration may correct drift as a sensor ages
Audi A3 8P (2
Roger Clark Motorsport Billet Tumbler Generator Valve TGV Delete Kit Valve Guides/Seals The ALTA Drop in filterTumbler Generator Valves (or "TGV" as they are most commonly referred to) can be found on Impreza WRX, Forester Turbo and Legacy GT models from 2001 onward. Their prime purpose is to reduce emissions from cold idle to meet standards governed by the EU emissions regulations (similar regulations also exist for both the US and Japan). Whilst this may be good for the environment it does little to aid the performance of your car and it's not uncommon for
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