130,000 miles A4, just did:

Oil Change
Plugs/Wires
Air Filter
Fuel Filter
Trans Filter
Fuel Injector Cleaner/Throttle Body butterfly cleaner
Trans Fluid Flush
Power Steering Fluid Flush
Diff fluid change
New Nitto DR's
New Oxygen Sensors

Mods:

3.73 gears
vig 2800 stall converter
lca's
complete suspensioin upgrade


Also around what HP should I be at?

 

Id say with that stall and those nittos, ...............high 13s. If your rear end holds

 

That is close to the same mods I have and I run 8.70's spinning with 1.8x 60 ft's. My mods are in sig and I have 160,000 miles.