Daylanv

Hey, I'm new to the forums, and I have a question for y'all. I'm looking to get rid of the restrictive OEM cats on my 2012 G37s, but I don't want test pipes. I have Top Speed Pro 1 cat back exhaust. What is the best HFC out there that doesn't drone.

Vizard_87

iTrader: (13)

fast intentions resonated high flow cats are good

hockeyzbh

yea FI RHFC are meant to be best on market but they expensive. If I decide to go HFC I am def getting them

IMfam0us

iTrader: (1)

Agreed fast intentions makes a good one. I had a set to go on my 08 but that got totaled before had lol my 11 came with ark hfc and I've got no complaints on them

PNW_IPL

iTrader: (5)

Id do Z1 . At 100cpsi they flow the best and they have transmission bracket as well as built in j bung cel fix to keep check engine light off. Quality material.. however if get different manifold gaskets as theirs are too thin to seal properly.
second would be berk hfc. They flow 200cpsi have built in cel.fix although not j hook style works well. Also have trans bracket.
More expensive than Z1. Same quality.

the_wolff

I have the berks and they drone with the stock exhaust and with the invidia q300. I often think about replacing them with FI RHFCs because it's pretty loud driving around the neighborhood (I live on the side of a mountain, and pretty steep hills at low speed put me in the drone-zone).

kroy

z1 and berk are fine. fi rhfc if you want the quietest hfc option.

NealP

I'm selling some Z1's if you're interested let me know but if you're looking for the least drone then RHFC is the way to go.

https://www.myg37.com/forums/private...ght-parts.html