Hey guys,

Just installed my Fast Intentions HFC's on my sedan w/stock exhaust.

Install took about 2 hours and the car was on a lift.

First Impressions:
Really really RASPY for the first 30mins or so.... THEN...
As if out of nowhere the CATS started to sound differently, smoother, and they definitely sound like a G35 coupe. I even put it up on the lift again and reved it to make sure there were no leaks or anything like that...

Is there a break-in period for these Ceramic cats???



Ok, now the other thing I noticed... The Idle on my car is a little rougher. It fluctuates a little if barely any.

I reset the ECU, did everything, but at idle i can tell that the Cats have definitely done something, via it be good or bad. Maybe I need a tune after I install my intake????

Anyhow, I really like the FI Cats and they seem to be breaking in and producing a better sound as I drive more and more.

Has anyone else had the idling problem? Could you tell a small difference in your idle?

Thanks everyone,
DRes

 

bump, thinking about getting HFC, mixed between FI and Berk. Wondering if the idle problem was resolved? also how many miles on them and how are the behaving now?

thanks

 

Never had any idle issues after installing my Invidia HFC's.
I think it is an unrelated issue. I've seen hundreds of HFC/TP posts and this is the first time I hear of this issue.