topspeed pro1 with hfc (video)

NickTurnon

How is the sound IN CABIN? Drone?

The cheaper top speed exhaust sounds like it rattles when you decelerate.

If you watch the videos, it sounds like a metal grind on downshifts etc..

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ts-c63

When I get on it its loud in the cabin, but when im just driving normal its not bad at all. I do have some GTmat soundproofing in the truck so that does help alot. Drone is very minimal but I was expecting to get some drone after I installed the HFC.

As for metal grinding sound on downshifts none of that here, just some slight rasp and the typical "hiss" which is completly normal with our engines.