We have 93 octane and race mode and have yet to run the race mode or the 93 octane program with race gas. The only chips that were tested with race gas were, MTM, X CHIP, XR CHIP, and ABT with ABT and XR pulling the hardest, When we test the APR we will post the results.

Having both the X Chip and APR tuned M Box ECUs I feel that the X Chip is by far a more aggresive chip. I know the A Box ECU with APR programming was a animal but the M box is far from being one. APR is a good chip for the features it offers but in the power department X Chip gets my vote!!!!!!

2001.5 Brilliant Black S4
GIAC X Chip
Borla Cat Back Exhaust
Tanoga Short Throw Shifter
AWE Center Vent Boost Gauge
AWE DTS
Darintake
K&N AIR Filter
710 N Diverter Valves
APR Bi-Pipe

also APR Chip with EMCS ( 4 stages )