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Hfc vs catless

 
Old 05-15-2019, 11:44 AM
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c63 coupe p31weistec stg3
Hfc vs catless

What is the difference between high flow cats from arh vs catless
long tube headers xpipe and custom 3 inch rear from arh
trying to avoid the smell
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Old 05-15-2019, 11:57 AM
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If youre trying to avoid the smell, or trying to avoid polluting the air more than neccesary, go with HFC bro.

With 200 cell cats you will hardly notice the difference between open pipes. And makes a big difference on the smell.

We all breathe the same air brother!

Source: compared my headers hpipe car with HFC side-by-side with headers car without cats. No noticeable difference in sound, but noticeably less smelly.

PS: go with H pipe over xpipe. No matter what BLKROKT tells you, x pipe is terrible exhaust note for our cars
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Old 05-15-2019, 12:03 PM
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Originally Posted by NotABaller View Post
If youre trying to avoid the smell, or trying to avoid polluting the air more than neccesary, go with HFC bro.

With 200 cell cats you will hardly notice the difference between open pipes. And makes a big difference on the smell.

We all breathe the same air brother!

Source: compared my headers hpipe car with HFC side-by-side with headers car without cats. No noticeable difference in sound, but noticeably less smelly.

PS: go with H pipe over xpipe. No matter what BLKROKT tells you, x pipe is terrible exhaust note for our cars
I would like to hear your car. Do you have a video. Iím headers cat less and x pipe. The stock resonator is an h pipe. Curious on your sound difference.
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Old 05-15-2019, 12:06 PM
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I had 200 cell hfc on my arh setup it was good not much smell, heres a pic you can see where they are in the setup

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Old 05-15-2019, 12:10 PM
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old video clip, i believe resonator was deleted in this i eventually put it back to give it more grunt


I have an eisenmann race catback now and have another set of catted arh on the way, really looking forward to hear how it will sound

Last edited by Arjy; 05-15-2019 at 12:13 PM.
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Old 05-15-2019, 01:15 PM
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X pipe sounds amazing.

HFC lose hardly any power and it also sounds better than straight.
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Old 05-15-2019, 01:37 PM
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Originally Posted by AMGonFire View Post
I would like to hear your car. Do you have a video. Iím headers cat less and x pipe. The stock resonator is an h pipe. Curious on your sound difference.

long tubes + hfc + h pipe then straight to stock mufflers.

The best sound IMO (after stock with secondary cat delete)
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Old 05-15-2019, 01:37 PM
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I'm with BLKROKT. HFC and an X-pipe sounds amazing.

HFC will cost a little HP which you probably will not miss so much on the circuit vs the strip.
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Old 05-15-2019, 01:56 PM
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Any reason to get HFCs if you live in an area that doesn't do emissions? Wouldn't it make the car quieter and cost you a couple HP/TQ vs straight pipes?
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Old 05-15-2019, 01:58 PM
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The smell is probably the main reason you'd want them. I cant compare with catless but with 200cell its still crazy loud
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Old 05-15-2019, 02:29 PM
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Originally Posted by G_Money View Post
Any reason to get HFCs if you live in an area that doesn't do emissions? Wouldn't it make the car quieter and cost you a couple HP/TQ vs straight pipes?
Smell and pollution. Cmon man letís try to do what we can.... to not **** up the air TOO much
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Old 05-15-2019, 03:08 PM
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I put some stainless works HFC before my xpipe on the mbh headers. Car still sounds insanely loud and actually better than without them. And my clothes donít reek like fumes. Havenít noticed a difference in power except I feel I gained some low end torque which I lost being straight through.
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Old 05-15-2019, 03:20 PM
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Originally Posted by NotABaller View Post
Smell and pollution. Cmon man let’s try to do what we can.... to not **** up the air TOO much
Then why do you have headers with 200 cell cats? You're likely over the accepted emissions threshold with them on your car.

Just sayin...
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Old 05-15-2019, 03:21 PM
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Originally Posted by Jasonoff View Post
Then why do you have headers with 200 cell cats? You're likely over the accepted emissions threshold with them on your car.

Just sayin...
Youre right we should all drive Prius
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Old 05-15-2019, 03:41 PM
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Originally Posted by NotABaller View Post
Smell and pollution. Cmon man letís try to do what we can.... to not **** up the air TOO much
I dont think my comparatively hyper-effecient M156, even with straight pipes, matters too much when you have most of Asia and all of Africa polluting enough for everyone.
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Old 05-15-2019, 04:27 PM
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Originally Posted by G_Money View Post
I dont think my comparatively hyper-effecient M156, even with straight pipes, matters too much when you have most of Asia and all of Africa polluting enough for everyone.
I agree. One of those massive cargo ships = 10000 of our cars, and maybe add a zero or two.
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Old 05-15-2019, 05:07 PM
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Originally Posted by NotABaller View Post
Youre right we should all drive Prius
I guess you didn't understand my point. Your treehugger comments are hypocritical...
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Old 05-15-2019, 05:21 PM
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Originally Posted by Jasonoff View Post
I guess you didn't understand my point. Your treehugger comments are hypocritical...
Trees are for smoking
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Old 05-16-2019, 12:48 PM
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Originally Posted by gzim335 View Post
What is the difference between high flow cats from arh vs catless
long tube headers xpipe and custom 3 inch rear from arh
trying to avoid the smell
I would have to agree with the masses here. Arh with 200 cel cats and xpipe is perfect. Let me know if you want to hear them in person. I'm local in nyc.
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Old 05-16-2019, 01:04 PM
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Originally Posted by I am Jeff View Post
I would have to agree with the masses here. Arh with 200 cel cats and xpipe is perfect. Let me know if you want to hear them in person. I'm local in nyc.
Iím mainly concerned with the smell,i wonít have a stock rear exhaust so sound wonít be the same but thank you for the offer.
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Old 05-16-2019, 07:50 PM
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The "smell" is kinda kick *** IMO. Might not be driving a "race car" but sounds and smells like it! haha

I'm running AHR LTH, 200cel cats, X pipe, to 3" SS pipe, to dual resonators, to stock cans. Its amazing.


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