All tests are on a foxbody stock 5.0L. Short Belt: Stock @ 2500rpm 117hp/245tq Short Belt @ 2500rpm 118/247tq Stock @ 4000rpm 195/256 Short Belt @ 4000rpm 197/258 Stock @ 5000rpm 203/213 Short Belt @ 5000rpm 208/218 Stock @ 5800 163/148 Short Belt @ 5800 168/162 Remove Accessory Belt: Stock @ 2500rpm 117hp/245tq Remove @ 2500rpm 118/249tq Stock @ 4000rpm 195/256 Remove @ 4000rpm 202/265 Stock @ 5000rpm 203/213 Remove @ 5000rpm 217/228 Stock @ 5800rpm 163/148 Remove @ 5800rpm 182/165 Timing advance from 10* to 15* @ 2500rpm stock = 117/245 @ 2500rpm bumped = 118/249 @ 4000rpm stock = 190/250 @ 4000rpm bumped = 195/256 @ 5000rpm stock = 197/207 @ 5000rpm bumped = 203/213 @ 5800rpm stock = 156/141 @ 5800rpm bumped = 163/148 Ice Intake (this one suprised me) (with flowmasters) @ 2500rpm stock = 118/249 @ 2500rpm bumped = 128/269 @ 4000rpm stock = 202/265 @ 4000rpm bumped = 211/277 @ 5000rpm stock = 217/228 @ 5000rpm bumped = 223/234 @ 5800rpm stock = 182/165 @ 5800rpm bumped = 185/167 All stock car with flowmasters, modified it added quite a bit more. Synthetic Lubricants added 2hp and 4-5tq. Removed Air Silencer added 2hp/4tq @ 2500rpm and @ 4800rpm 6hp/8tq Underdrive Pulleys added 2hp/4tq @ 2500rpm and @ 4800rpm 8hp/9tq Then there are MAFs, Intakes, Exhaust, TBs, Blowers, Cams etc. They all have full dyno numbers from 2500-5800/6000rpm but I just shortend them to make it easier.