From what little change has occurred I'd agree with the above. This is known as octane creep. Carbon builds over time in any engine and the carbon getting hot can cause detonation. Also. carbon buildup changes the physical volume of the cylinder slightly, raising compression.

 

Good thinking - his intake mani could be all icked up from blow-by, etc and no catch can.

 

first, if anything is ever funky with your car(tuning wise), contact you tuner,.. they are tuners for a reason. but of course posting for opinions ALWAYS helps.

second, try doing a boost leak test on your car. there are TONS of write ups all over the internet. with a MAF read car you can have the slightest leak, and that could make your car run like poo. and yes leaking air would actaully make you run rich but its a start.

i check mine at least twice a month just because i rag my car out all the time. start at the turbo inlet and fill it up with about 30psi of air. use a spray bottle with soap water and start from the turbo outlet to the intake mani. youll be supprised how many leaks your car has if youve never done this.

GL bud