Quote:
Originally Posted by miller
Yep. They're a vacuum-activated set of valves just inboard of the stock exhaust tips. They only open when in M mode. When open, you can notice a slightly throatier note and it enhances the "burble" when coming on/off throttle and during shifts. If you look at the back of your truck, you can see them on the inner tips (right-most on the driverside, left-most on passenger side).
Some aftermarkets use an electronic set of valves or, like the Akrapovic, utilize the OEM vacuum-activated valve system to get the same effect - quieter cruising when closed, louder when open.
I want that slightly deeper sound and burble all the time. And, I want my tips to discolor/dirty at the same rate. The stock outer tips get much blacker than the inner tips and it looks like something is wrong. Again, personal preference, not performance-oriented.
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looking forward to hearing theese.