So I am considering getting a tune but I am looking for thoughts on 2 subjects. Car is '08 OBXT, Grimmspeed DWG DP, Cobb stage 2 LWG map, silicone intake and throttle body hoses and a lightweight pulley. At 99k miles is it too late in the engines life to get a tune? Should I check valve clearances first? All other maintenance is up to date @ around 11k since plugs,belts,water pump ETC.