Quote:
Originally Posted by KingLT1
The NPP version still drones with the valves open at cruising speed which would be identical to the non NPP version the OP listed. The NPP version allows the valves close directing the exhaust path from the Outlaw muffler to the 40 series muffler and that eliminates the drone.
If you have not tuned your NPP exhaust valve settings then your valves close when cruising at hwy speeds in all modes and there will not be any drone. I have my valves tuned to stay open under all conditions in track mode which simulates having a Outlaw only system, and it without a doubt drones. It's not horrible and at times I do like it, but I am not sure I would want that 24/7...only reason why I mentioned it because the OP is asking about the NON NPP version.
I have my NPP tuned as follows.
Touring- Exhaust valves closed under all conditions until 4000rpm then they open.
Sport- Exhaust valves open under all conditions, except 8th gear I have them set to close to eliminate drone at cruising speeds 45+ mph.
Track- Exhaust valves open under all conditions which would be similar to pulling the NPP fuse.
Stock programming.
Touring- exhaust valves are pretty much closed under all conditions except start up and wot.
Sport- valves open full time other then they close from 3rd gear under part throttle conditions.
Track- similar sport except the valves don't close until 5th gear part throttle and they open faster in relation to rpm and throttle input.
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I have messed around with mine quite a bit and with my new headers and no cats I came to the conclusion that with my setup i could no longer fully close the valves with out getting a horrible leaking air sound going through the small gaps the valves make (think blowing air out really hard through just your top teeth)
Touring- I have the valves at 95% closed and at full throttle I have them open to 60%
Sport- I have them 40% open (sounds really aggressive and deeper) and fully open at wot (way loud and too raspy).
Track- is of course fully open like yours