I have the limited model crossfire. Came with the infinity system.

When it was installed all they used was a European harness. The unit sounds great. I don't have any distortion or anything like that.

Although I may do some upgrades in the future, right now the stock system is ok.

Most folks think I already have a aftermarket system and I just tell them its all factory except for the head unit.

Hmm, maybe I am missing something but if it could sound better out of the infinity system I'd like to know how.