Have these on my 370Z, once you get past the "Demon bolts" on the install the rest is smooth sailing. These add a more aggressive tone to a stock Z you'll love it. I've had no issues with my O2 sensors, CEL, etc when I installed these. Pairs great with the Berk CBE or any CBE really. Good deal here people!
Here's the DIY guide from the forums:
Berk HFC Install
GLWS!