HFC Options
 

I've had my Z for 2.5 months now, I'm past my breaking in point.
The exhaust is just disappointing, my bone stock cobalt is louder with a deeper tone.
I did some research and seems like a HFC is a good starting point.
Berks seems to be the most popular.
Basically what I'm looking for is maximum power gain and quality with some added sound.
:ughdance:

They're all about the same. Fast Intentions or Berk.

I have the Berk HFC's and I would recommend them to anyone looking; build quality was good and fitment was perfect. Mine had a bit of a lead time, not bad only like 2 weeks, but the company was very good about keeping me informed.