My results from the exhaust guide

[Glassdude]

It's still blue here. How did you turn your sky black -popcorn -popcorn

 

[ChrisMartinTX]

i heard you can adjust the timing with a programmer... or turn the star wheel till you get the desired effect ;-)

 

[ForumBlue]

500 hp chip and propane with stock rods will turn it a nice smokey grey. With a little bit of thunder.

 

[JIM_C]

Turning your sky anything other than blue will VOID your sky's warranty! DON'T DO IT!!!