[FrankiE90]

Cobb for the n55 is still far from being work'd on.

i would put back your stock exhaust - if
you go with a tune. if you want to change up
the oem exhaust you can weld different tips on.
Reason why, is to maximize your performance.
the muff delete doesn't benefit our N55s.
also with the tune, your n55 will sound different - more
aggressive.

and have you thought about a DP -
the procede and a DP is such a great combo.

Procede is a solid choice.
There's a good number of members on here
with the N55/procede that chime in frequently.
Shiv's been here with a full tune for the N55
from the beginning.
The updates get better and better.

I daily drive with the tune and
haven't had issues just great performance.
it's solid.
just make sure your DME is updated.

good luck with the mod'n.