hello everyone. i have just purchased a 2002 wrx it has some engine issues. upon purchasing the car i was informed that it may need an engine but it was too good of a deal to pass. so long story short after pulling the engine and tearing the heads off. the only problem found was burnt exhaust valves on pistons 1 and 3. i got the engine all fixed and am putting it back in the car this weekend. what im trying to find out is if my car is running to lean. the engine is fairly stock it has stock injectors but has aftermarket fuel rails ,aftermaket pulley, and TBE exhaust. there is also a greddy boost controler installed in the car. i have not used it but i have been told that the previous owner prob had it cranked up and pushed way to much boost with no ECM upgrades causing this to burn the valves. can that be correct? i would like to run the car with the current mods im looking at running stage 2 cobb the car apprears to be ready for stage 2. so long story short what is the cause of buring valves and how can i tell that my car is getting enough fuel and not getting too hot??? anything helps i know im all over the car i have been reading threads for a couple weeks. seems that mbc are frowned upon so i will hold off on that i would like to know exactly how they work and whats the purpose of using it if they are not recomended?