Go with the company that has taken the time to provide written (dyno) results of HP gains (Speed Innovations) Understand that all of these updated timing programs are basically the same software that is developed by Bosch. They are sold on a CD and then re-sold under different company names eg. Powerchip, Inmotion, Upsolute, etc.

Some tuners take the time to alter the maps slightly, to goose a bit better result, but this takes multiple testing dynos and tweaking...

I recommend SI because they have verifiable hands-on experience with the Crossfire N/A and SRT6.