[OutlawDrifter]

there is no way 2.5" tail pipes are over scavenging. the manifolds and cats are not efficient enough for that to happen. i average 16.4mpg hand calculated, with no tuner or CAI. you would need some serious exhaust for it to over scavenge, and a camshaft with a lot of overlap, which the stocker does not have.

you forgot the driver mod, 2 identical vehicles with different drivers will execute different results. you friend is enjoying the sound and extra power more than you are, that's easy to see.