HFC or TEST PIPE question

[07bluerocketZ]

has any of the VQ35HR owners installed test pipes or high flow cats yet??if you have which kind and do you feel a difference in power and/or sound?

[Low_Cost]

I'll be installing Berk High-Flow Cats either this weekend or next week. I'll let you know if I notice any difference. (Going to pair them with a Borla or HKS Hi-Power)

From what other say, it sounds like you'll gain a few HP from HFC's and even more so from the test pipes. It will also change the sound of your exhaust. HFC's seem to add a meaner tone to the car and test pipes make it much louder. This is all heresay though, as I haven't heard the difference my self... yet.

*Edit* Test pipes will throw an engine light and fail emissions. Just FYI.