The only thing that really adds power you have is the Tune, your truck was lucky to run 17 seconds stock. I'd be suprised if it'll get into the upper 15s as it is now. Stock size tires helps too.

99s were just flat out slower stock, I used to own one. Not trying to rain on your parade man. Just take it to a track and run it.



FWIW - it'd take me gears, stall, and cam to get about 14 flat as my truck is now... and it's not stock.