I just got a 08 maxima SE a few weeks ago, i have always had a mustang but really like the comfort and power of this car, but the modding has begun...

i have already ordered a set of voxx wheels and some power stop drilled & slotted rotors

my question is.. is it worth doing a cold air kit to these cars and do you have to re-tune the car after installing? my last car (06 gt mustang) had to be re-tuned

and does anybody make a good sounding exhaust kit for these cars? i love the way some of the 2 door infinities sound