Hi, a tune will definitely help maximise the potential of your vehical. Talk to your tunner about what your trying to acheive. I have a similar setup, BA-NA, headers, exhaust, high flow cat, cai, K&N airfilter and underdrive. Went from 167rwkw untunned to 188.7rwkw after the tune. Improved driveablity, fuel economy (unless I give it a boot full), and made it just a little bit more plesant to drive all round (I love it actually). As my son is learning to drive and for insurance reasons cant drive our other cars he will be driving this car on his "P's", that's why we purchased an NA. Hope that reply was usefull. Cheers James.