Can anyone shed any light for me...have recently bought a 350z totally standard, what are the best mods for me to do? i was thinking exhaust cat back...but also thinking of just taking the cat off as mot isnt a problem for me, have ordered air filter. Not sure though if i have a de cat if it will spoil the sound of the car and just make it stupidly loud...which i dont want, but i do want the extra bit of power.