Hello All : I need feedback from smarter people than me for an issue I am trying to figure out. Heres what I am working with : 2002 ALH , rebored,fully studded, new head heavily ported, Colt stage 3 Cam, 1752 Hybrid Turbo, SS 3" exhaust , Bosio 520 nozzles ,PD intake EGR delete , FMIC , 3 bar sensor ,new MAF , Malone stage 4 tune ,rover Blow by separator . Timing set to slightly center high with VCDS , IQ set to 5 , 11MM IP & DRW 6 speed conversion. The issue I am experiencing is usually in 3rd gear ( spirited ) pulling from 2500 - 3K I get a backfire, and it seems to go into the intake because I then get no power & alot of smoke until the "exhaust" works its way through the cylinders and the engine recovers again...and it again runs like normal. Below and above this RPM range everything is fine. I have no mileage issues and have had the car over 200KM/Hr ( testing)with no fuel issues. I looked at the LP relief valve in the IP and yes, it was out half way, pressed it back and replaced. The only Mod I have not done yet is the PD tank pump addition... which is coming up. I`m relatively certain Cam timing is deal on . I would really like to here from someone else who experienced this that info would be greatly appreciated, Thank you.