Thread: DIY Exhaust Mod – Gain of 10+ HP!!!
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Old 01-12-2014, 08:00 AM   #167
chipmunk
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Join Date: Jul 2013
Location: Kent, United Kingdom
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Garage
1 inch is quite a big hole. How does it sound?
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2003 Boxster S
Last edited by chipmunk; 01-12-2014 at 08:03 AM.
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