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This has been debated many times. The decrease in airflow is negligible and IMO is better than the loss of cooling caused by the build up of debris. There is a DIY on Pedro's site that uses gutter guard. Some use plastic, some use the aluminum. Mine are aluminum and work great. You can also buy prefab ones but they tend to be expensive.
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2001 Boxster S Lapis Blue
TS Cat Bypass Pipes and exhaust
iPad Mini Dash Install
DEPO Tail Lights
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