OK, so I want to do two mods right outta the block. Corsa cat-back exhaust and an LMR CAI. Is it absolutely necessary to get a tune after doing these two mods? I know that with a tune, there will be more HP gains, but will the car run right if a tune isn't done after these changes? I will eventually get a tune if it's not necessary right off the bat, but I don't want to make these changes, then discover that the car runs like crap without the tune. I've read through just about every discussion on the mods, and some threads compare HP numbers with each mod and a tune at the end, but none of them really mentioned that a tune was required after the changes.