What's everyone's personal opinion of the FI RHFC? I'm thinking of buying them. My stock ones are taking a crap. I have a 2013 coupe. Also, the option to get the extra 02 bung? I'm running stock exhaust. Is that needed? Appreciate the help

 

I've had mine for 10 years and 36k miles. Ran them with the OEM catback for the first year, then matched them with a Fast Intentions catback. Never had a problem, and I think they're a top-shelf exhaust product. No regrets.

 

Got mine in 2018, matched with a FI catback. Biggest resonators available from FI on both. No notes - fit, performance and sound are all A+.

 

I love my Fast Intentions resonated high flow cats, no regrets highly recommended. The extra bung is optional and not really needed unless you wanted to add wideband gauge to monitor your A/F for dyno and tuning purposes.

 

How was the sound after stock? Right now I just have a beluga axle back but I'm pretty sure my cats are going out, I dont wanna be really obnoxious when I get these. I doubt it'll be bad because they have decently sized resonators

 

Cats will be a little louder for a while and then mellow out a bit. I have those connected to a modified Nismo exhaust and they kind of gave it the Euro burble, which I like. Had them for about 6 months and love them. Plans are to go full FI exhaust after the winter.

2009 G37x coupe

 

These are high quality products well worth the money. I bought mine from Facebook group for $250 ran them for 2 years had to take them off due to smog check, planning on put them back soon. They sound great with the full meisterschaft catback

Cold start rev video
enjoy @xxg000w0