How many miles does some one have on the race box or other quad box.I read on another post about them being hard on the fuel system.Pump,injectors,relief valve ect.Just installed my race box and have noticed abig diffrence in engine sound.More rattely like an over timed gas engine.

 

I have about 10K on mine now (trouble free) may be getting rid of it in favor of a timing only box.

 

I have over 10k on mine with no issues. I did add an Airdog fuel pump and filter assembly first, and I also use a fuel conditioner/lubricator every tankful.