| | BASELINE | SNOW | DIFFERENCE |
| RPM | Boost | Boost | Boost |
| 1,677 | 4.40 | 4.40 | 0.00 |
| 1,502 | 5.30 | 5.30 | 0.00 |
| 1,710 | 6.00 | 6.00 | 0.00 |
| 1,945 | 6.50 | 6.50 | 0.00 |
| 2,171 | 7.10 | 7.10 | 0.00 |
| 2,408 | 7.60 | 7.60 | 0.00 |
| 2,642 | 8.10 | 8.10 | 0.00 |
| 2,879 | 8.50 | 8.50 | 0.00 |
| 3,115 | 8.80 | 8.80 | 0.00 |
| 3,350 | 9.20 | 9.20 | 0.00 |
| 3,582 | 9.70 | 9.80 | 0.10 |
| 3,816 | 10.20 | 10.20 | 0.00 |
| 4,043 | 10.30 | 10.40 | 0.10 |
| 4,268 | 10.40 | 10.40 | 0.00 |
| 4,505 | 10.30 | 10.40 | 0.10 |
| 4,738 | 10.30 | 10.40 | 0.10 |
| 4,953 | 10.30 | 10.30 | 0.00 |
| 5,179 | 10.20 | 10.30 | 0.10 |
| 5,396 | 10.10 | 10.20 | 0.10 |
| 5,610 | 10.10 | 10.20 | 0.10 |
| 5,813 | 10.30 | 10.40 | 0.10 |
| 6,025 | 10.40 | 10.50 | 0.10 |
We passed our test '07 Shelby GT 500 over the chassis-dyno's rollers at KAZ MotorSports and recorded an initial baseline of 487.10 hp and 503.00 lb-ft of torque at the rear wheels. These numbers are on par with similarly equipped Shelbys we've tested (cold-air, pulley, and exhaust), so we forged ahead with our evaluation.
Once the Snow Performance Stage 2 MAF Boost Cooler was installed, Kenny Kouba went about tuning our GT 500 for good air/fuel initially (12.1:1), and then for power by steadily increasing timing in accordance with the water/meth injection.
The fact that timing advance contributes to a horsepower gain is well documented. But it's also a fact that increasing timing in a supercharged engine-using pump gas-is like pulling onto a freeway via the off-ramp. Bad things are bound to happen when the boost begins climbing.
In our research, we found this isn't the case when the cooling effect of water/methanol is thrown in the mix. Kenny was able to build on our initial 21 degrees of baseline timing to a final-and whopping-29 degrees of total timing by the time we finished on the dyno. The timing advance put 544 horses and 552 lb-ft of torque on the rollers, with minimal cooling effect in the air charge and spark plugs that were regapped to 0.030 inch.
DiabloSport's Predator and PC interface are invaluable tools that KAZ MotorSports uses to tune Shelby GT 500s with power mods. This unit (PN U7145) comes loaded with a tune for modified Shelbys, but additional custom tuning is mandatory.
Kenny stands behind the baby-steps principle for custom tuning, making timing and fuel changes in small increments that eventually lead to maximum power without threat of harmful detonation.