I need some help. I have a '08 nrs with pcv/ autotune. I'm trying to go with the best afr table. Reason I'm having problems is that I bought a wicked airbox and I'm running topless with a K&N filter. Motor was running a little hot so tried dropping the afr's alittle but now it runs cooler but has a pop every once in awhile in the cruising range. My mods are wicked airbox, topless, K&N airfilter, V&H indy comp pipe. Any suggestions would be greatly appreciated.