Dynoed my 03 1500HD finally

[xtremejimmy]

stock lq4 w/ ebay cold air intake, obx longtubes, magnaflow exhaust, TB bypass mod, e-fans and dyno tune

on h2 wheels with 35 inch tires
diablosport superflow dyno (known to read 15-20hp lower than dynojet)

295whp
340rwtq.

I wonder how much difference it would of made if i was back on the stock wheel/tire combo. Ended up adding 31 degrees of timing up top!

[custm2500]

Your numbers should go up slightly with stock tires but I don't think all that much. What motor do you have. Sorry I don't know all the codes.

[xtremejimmy]

the 6.0 motor. Same one they stick in all the 2500's, and denali.

[chevy7398]

dang thats pretty good to the wheels!

[xtremejimmy]

thanks! still feels like first gear sucks! Damn 80e tranny and its long first gear. But once its moving, it moves out really nice.