|
Question about HFC's/RHFC's and rasp.
Hey guys. So I'm replacing my cats but have a dilemma. I have straight through exhaust from the cat back and don't want to add any rasp when I replace my cats. SO. FI RHFC's, FI HFC's, or Test Pipes? What to do, what to do… opinions?
|
Resonated test pipes did me well back in the day. Resonated HFC's would be the best of both worlds.
|
if you have a straight through I d go with RHFC
|
Originally Posted by G37Sam
(Post 3926850)
Resonated test pipes did me well back in the day. Resonated HFC's would be the best of both worlds.
|
Originally Posted by ChinkyChoy
(Post 3926856)
if you have a straight through I d go with RHFC
|
I think FI is the only company that makes a resonated HFC.
|
1 Attachment(s)
Originally Posted by MaQG37
(Post 3926895)
I think FI is the only company that makes a resonated HFC.
http://cdn3.volusion.com/545uq.yxqp2...900-0010-2.jpg And this isn't a cat, but MXP has these double-resonated test-pipes. Kind of steam-punk looking. Attachment 185694 |
As far as volume goes, what will be the quietest guys?
|
Originally Posted by Rochester
(Post 3926907)
No, the ARK cats have a Helmholtz resonator tapped in right next to the catalyst. It's a pretty funky design.
[IMG] And this isn't a cat, but MXP has these double-resonated test-pipes. Kind of steam-punk looking. I forgot about ARK's. I'm considering their resonated test pipes vs Motordyne's.
Originally Posted by ScrewstonNismo
(Post 3926973)
As far as volume goes, what will be the quietest guys?
|
Originally Posted by ScrewstonNismo
(Post 3926973)
As far as volume goes, what will be the quietest guys?
Hows that for completely BS numbers? :D |
I went with Stillen HFC's (which are non-resonated) and it's suppppperr raspy and loud as hell. I love the rasp and hissing so I didn't care but I've heard cars with RHFC's and they're much much better with the rasp.
|
I have rasp with Fast Intentions HFC's on hard acceleration.
|
Originally Posted by Thirty_Seven
(Post 3926999)
I went with Stillen HFC's (which are non-resonated) and it's suppppperr raspy and loud as hell. I love the rasp and hissing so I didn't care but I've heard cars with RHFC's and they're much much better with the rasp.
Originally Posted by AroundTheG37
(Post 3927059)
I have rasp with Fast Intentions HFC's on hard acceleration.
Getting some Magnaflow HFCs installed Thursday and all this rasp talk is making me a bit cautious about going forward with it. Maybe i should just save up a little more and do a full CBE and leave it at that... |
Originally Posted by ColumbiaSkinny
(Post 3927064)
Is the rasp from the HFCs on stock exhaust? Or do y'all have other exhaust mods on yer Gs as well?
I have the FI RHFC and 2.50" FI catback w/18" resonators. He has vastly better hearing than I do. I say that literally, because I'm deaf in one ear, and he's hyper-sensitive to noises many people wouldn't notice. So if he says there's a noise, then there's a noise. That's a fact. How much that noise bothers you vs. him is another matter, and a personal valuation. As a side note, AroundTheG37 would benefit from having a sig-line of mods that provide context to his comments. :hsugh: |
Originally Posted by Rochester
(Post 3927066)
AroundTheG37 has the FI RHFC and 2.25" FI catback w/12" resonators.
I have the FI RHFC and 2.50" FI catback w/18" resonators. He has vastly better hearing than I do. I say that literally, because I'm deaf in one ear, and he's hyper-sensitive to noises many people wouldn't notice. So if he says there's a noise, then there's a noise. That's a fact. How much that noise bothers you vs. him is another matter, and a personal valuation. As a side note, AroundTheG37 would benefit from having a sig-line of mods that provide context to his comments. :hsugh: What's funny is Fast Intentions guarantees no rasp with their full system. LIES!, lulz. Here's the quote from their page.
Originally Posted by Fast Intentions
(Post 3927066)
Absolutely NO RASP from RPM idle to RPM redline in conjunction with our G-Sedan cat back exhaust system.
|
| All times are GMT -4. The time now is 03:42 AM. |
© 2026 MH Sub I, LLC dba Internet Brands