iSmash

Hi everyone,

I have a 2011 G37 coupe and I've recently installed a Motiv Concept HFC and a Fast Intentions CBE. I had them both installed at the same time, and after a few weeks of driving, I now hear a lot of droning. It is ridiculous, and I was wondering which one (HFC or CBE) is causing this droning so I can swap out the right one. Thoughts appreciated. Thanks

sideburns2009

I'm no expert on exhaust but I'd be inclined to think you'd get more drone from the HFC. That's a lot of restriction removed. HFC on stock exhaust or Tanabe Medallion (pretty quiet exhaust, zero drone) is quite loud, as is. Though, they're probably both producing a drone and removing either would likely only reduce but not remove the drone.

I'm not familiar with the Fast Intentions exhaust. The drone wasn't onset?


I drove a stock Q50S that had the "Infiniti Sport Mufflers" (I believe the coupe mufflers fitted to the sedan) and it had so much drone. Of course, a quieter muffler would hush the HFC either way. Could you not try your stock exhaust with the HFC or is it all custom now?

Vizard_87

iTrader: (13)

Is your Catback resonated? I had fast intentions resonated hfc & Catback and no drone.

milkcow500

Resonators would def help cut down the drone if you don't have any. I got drone after installing my test pipes, so I had an X-pipe fabricated instead of running a y-pipe and it completely killed off my drone.

iSmash

Thanks for the thoughts. The CBE is resonated. I don't have the OEM exhaust anymore, but I do have the OEM cats. I was thinking about swapping those back in and hope the droning is more bearable, but figured it's better to get some second opinions.

stevo4756

iTrader: (2)

OEM cats should fix most of your issues... Try that and come back if your still having issues.

iSmash

just an update, i switched back to the OEM cats a while back and it helped with the droning a lot. I would say 90% of it is gone.