OK, here is MY OPINION,
DONT go with JLT, it is NOT the best for out cars. Who is to say that anyway. JLT is know to have the "color match" wear off, and show metal.
I have the C&L Racer, and it is amazing, VMP gave me a custom tune, and it really woke up the car. 93 octane, you have a choice for 3 tunes...but 93 is all you will need. Save the remaining slots for tetris and brick breaker.
as for exhaust, I am a
Borla guy, so I am biased, but
borla is fairly aggressive without having a retarded loud, annoying sounding car. I ran that for a while, and I got to much gurgling and popping and rumbling when I let off the gas, I now have the MRT Catted H-Pipe, and boy oh boy, it sounds fantastic.
I have noticed that the wheels break loose alot easier ever since installing the H pipe, meaning it did the justice of sound and power.
as for your warranty, you will not void warranty from putting on parts for the MOST part. If you have a descent dealer, he will work with you.
Supercharger, yes that may affect the warranty, but CAI, no, exhaust, no... wheels,
suspension..no.... if **** goes south in a hurry, throw the stock crap back on and bam, done.
there are my thoughts.