After over 3 yrs of owning my Mustang, I finally plugged the stock intakes sound tube and hole in the firewall. Sounds soooo much better with my PypeBomb exhaust. Now I can just hear the exhaust and not all this other random intake noise. I had no idea how much quiter it would make the interior. Ford should've just put a louder exhaust on in the first place instead of engineering that whole mess of tubing. Cleans up the engine compartment, drops a few pounds off the front end, and sounds better inside (all for $11 and 5 min of work).