Berk HFC to FI RHFC
07-02-2012, 04:12 PM
#2
I currently am in the break-in period as I just installed these puppies on Friday.
So far the biggest differences I can tell between the two setups:
1. With the RHFC's, I do not get any drone whatsoever in any RPM band. The Berk's gave me an almost intolerable drone between 18-2200rpms, worst in 6th gear.
2. The light hiss that comes up when dropping to idle with the Berk's is a lot quieter and much harder to notice.
3. When cruising at 60-65, my normal speed, I really have to listen hard to hear the exhaust, but when I step on the gas to accelerate, the tone comes on hard and strong.
I'm not sure how I feel about it, because I liked the awesome loudness of the Berk's, but the drone and hiss were getting on my nerves way too much. The 24" or so of resonation in this setup might be too much. We'll see in a month or so when they are all broken in nicely. I might see if I can order a non resonated x-pipe from FI to get rid of 18" and just go with the 6" from the RHFC's.
Install was much easier than taking off the stock cat's because I had already broken the shtty bolt out when I swapped for the Berk's, and the main difference is that the underbrace no longer has a connection to the RHFC's, so I have that guy lying around here. Other than that, it was a breeze, the cuts on my hands say otherwise, but once you do it once, it's easy the second time.
So far the biggest differences I can tell between the two setups:
1. With the RHFC's, I do not get any drone whatsoever in any RPM band. The Berk's gave me an almost intolerable drone between 18-2200rpms, worst in 6th gear.
2. The light hiss that comes up when dropping to idle with the Berk's is a lot quieter and much harder to notice.
3. When cruising at 60-65, my normal speed, I really have to listen hard to hear the exhaust, but when I step on the gas to accelerate, the tone comes on hard and strong.
I'm not sure how I feel about it, because I liked the awesome loudness of the Berk's, but the drone and hiss were getting on my nerves way too much. The 24" or so of resonation in this setup might be too much. We'll see in a month or so when they are all broken in nicely. I might see if I can order a non resonated x-pipe from FI to get rid of 18" and just go with the 6" from the RHFC's.
Install was much easier than taking off the stock cat's because I had already broken the shtty bolt out when I swapped for the Berk's, and the main difference is that the underbrace no longer has a connection to the RHFC's, so I have that guy lying around here. Other than that, it was a breeze, the cuts on my hands say otherwise, but once you do it once, it's easy the second time.
07-05-2012, 06:36 PM
#3
Can you comment more specifically on why you think the resonation might be too much? I am looking at the same set up, but in all honesty, only have a vague sense of what the resonator does.
Of course, comments from others on the pro's and con's of the longer resonator would be appreciated.
Thanks for your help.
Of course, comments from others on the pro's and con's of the longer resonator would be appreciated.
Thanks for your help.
07-08-2012, 11:13 PM
#6
Great writeup, thanks for this! Sounds like they're doing exactly what they're meant to do, keep the drone/rasp away, yet still adding more/lower tone over stock.
Older Berks are a 200 cell HFC without resonator(newer are 300cell), so they will indeed be a bit louder then the 300 cell HFC WITH resonator, but the resonator is MUCH needed for the wanted/result sound.
Paired with a catback, I couldn't be any more confident you'll be 100% satisfied! Let me know when you're ready to order, I'd be happy to help!
Older Berks are a 200 cell HFC without resonator(newer are 300cell), so they will indeed be a bit louder then the 300 cell HFC WITH resonator, but the resonator is MUCH needed for the wanted/result sound.
Paired with a catback, I couldn't be any more confident you'll be 100% satisfied! Let me know when you're ready to order, I'd be happy to help!
Last edited by 1cleanG; 01-08-2014 at 05:06 PM.
12-29-2012, 06:58 AM
#7
Administrator
iTrader: (9)
Bumping this thread for insights.
I've been planning on BERK high-flow cats for some time, intended for Spring 2013. Recently I've been revisiting that decision in comparison to Fast Intentions. For example, I didn't realize the cell-count in the BERK was 200, whereas in the FI it's 300. I also never specifically recognized that the O2 bungs on the BERK are straight and short, whereas on the FI they're a "J" design.
Based on cell-count and the "J"-bung design, is it reasonable to expect no CEL (hopefully never) from the Fast-Intentions HFCs?
Secondly, I keep seeing reference to RHFC (resonated high-flow cats), but FI's website doesn't reference the "resonated" component of their design. Is the RHFC a different model than the standard HFC from Fast Intentions?
Here's the FI website info for their HRC: Fast Intentions
I've been planning on BERK high-flow cats for some time, intended for Spring 2013. Recently I've been revisiting that decision in comparison to Fast Intentions. For example, I didn't realize the cell-count in the BERK was 200, whereas in the FI it's 300. I also never specifically recognized that the O2 bungs on the BERK are straight and short, whereas on the FI they're a "J" design.
Based on cell-count and the "J"-bung design, is it reasonable to expect no CEL (hopefully never) from the Fast-Intentions HFCs?
Secondly, I keep seeing reference to RHFC (resonated high-flow cats), but FI's website doesn't reference the "resonated" component of their design. Is the RHFC a different model than the standard HFC from Fast Intentions?
Here's the FI website info for their HRC: Fast Intentions
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12-30-2012, 11:17 AM
#9
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iTrader: (9)
It's that J-bend design to the O2 sensor extensions that's really turned my attention towards Fast Intentions over BERK. Cost-wise, they're identical, once you include both optional/additional bungs. Now that I'm thinking FI, the next decision to mull over before Spring is whether or not to go with the resonated model.
BTW, if the OP is reading this: excellent comparison video. Very well done.
01-12-2013, 08:47 PM
#11
For any of your guys' Fast Intentions needs, please go here:
https://www.myg37.com/forums/engine-...s-is-here.html
They actually are NOT the same part #. Tony just doesn't have someone running the site. Lot going on at the shop with the Twin Turbo build
https://www.myg37.com/forums/engine-...s-is-here.html
They actually are NOT the same part #. Tony just doesn't have someone running the site. Lot going on at the shop with the Twin Turbo build
01-13-2013, 08:32 AM
#12
Administrator
iTrader: (9)
01-13-2013, 08:51 AM
#13
I,spoke to tony a few weeks ago and he even said the site isn't updated. They actually have a lot of products that aren't on the site.
Best bet would be to call him...or better yet, check with lance (1cleang) for your product questions.
Best bet would be to call him...or better yet, check with lance (1cleang) for your product questions.
Last edited by Rad_Slinger; 01-13-2013 at 01:21 PM. Reason: In a dumba$$
That's what I'm here for
01-13-2013, 11:28 AM
#15
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iTrader: (9)