On the exhaust I do like the stock a lot, better than the stock was on my Scat. I just want it a little louder and the Vibrants seem to do that without too much drone. I am leaving the resonators on. This is where the trade off is for me personally, the cost is not that much (just over 100 bucks for the pair of Vibrants) to get a little louder without performance that is okay at this cost. Now, no way you will find me spending over a grand for the Borla kit just for sound.
With regards to the LMI and other supposed CAI's .. while I love the sound, the trade off is almost not worth it based on cost (over 400 bucks) and also based on the fact I've seen people actually get higher IAT's with some aftermarket intakes, and on a stock car (no tune or other mods) the performance gain is little to none. Hpindy got some interesting results and had a good thread very informative.. however look at the mods on his car, it is not stock. I think the aftermarket CAI's come more into play with modded cars and get more benefit being a supporting mod.