This free mod for my Porsche 911 996. It is a cap to bypass the Helmholtz resonator in the air intake tube.

There are a few ways to get a cap for the tube:
(1) Castrol GTX oil bottle cap, (2) CAplugs.com - free sample of CPT-19, (3) caps from Lowe’s/Home Depot

The installation takes about 2 minutes to perform. It really wakes up the exhaust sound. I have the Foster D exhaust mod, and it makes it deeper rumble.

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