Good day folks, I already know that 8.5 to 9 degrees advance is optimum for a stock engine. I have also heard that those who are running a DPS pump should advance the timing 2 degrees. I had my truck timed on Friday & it's set @ 12.3 degrees advanced. I have a DPS turbo pump, new Stad injectors, new Beru glow plugs, new fuel return kit, ATS exhaust snail, ATS 3" exhaust elbow, 4" staight pipe exhaust after the down pipe. Now the question , Should I back the timing down that 1 to 1.5 degrees or leave bloody well alone? Thx in Advance!