Hi-Flow Cats vs. Resonated Cat Pipes

JPnAZ · 11-22-2011, 06:02 PM

Largest HP (Less retrictive)=Test Pipes
Street legal and somewhat quieter=High Flow Cats

Resonaters reduce "rasp" and "drone" noises from opening up the exhaust.

XwChriswX · 11-22-2011, 10:54 PM

Here's about as good a breakdown as I can make away from home:

Stock Cats

Suck

High Flow Cats (HFC's)

Either Ceramic or Metallic Core - You'll want Ceramic, last longer, least prone to core ruptures
Better flow than stock cats, but less than test pipes or headers
50/50 chance of passing sniffer tests
Still retain 'Stock' look for visual tests
Mild HP/TQ gain

(Resonated) Test Pipes

No Cat whatsoever
Will NOT pass sniffer tests
Better flow than Stock/HFCs, but less cleanly than headers or ART pipes
Resonated TPs will have less rasp/drone than Non-Res but performance is unaffected
Moderate HP/TQ gain

Advanced Resonance Test Pipes (ART Pipes)

No Cat whatsoever
Will NOT pass sniffer tests
Improved flow over regular (R)TP's
Slightly nulled rasp, but still noticeable
Slightly more HP/TQ output than regular (R)TP's

Long Tube Headers (LTH's)

Sex
As with (R)TPs and ART Pipes, no cat whatsoever
Smoother flow than all previously mentioned parts
Distinctive sound, slightly higher pitched yet quieter idle
Most Dyno proven gains out of the group.
Hardest Install of the bunch, but looks the best when completed.

Hope this helps with the basic idea.

11-22-2011, 06:02 PM	#1 (permalink)
JPnAZ Base Member Join Date: Feb 2011 Location: SoCal - Orange County Posts: 84 Drives: 09 Nissan 370Z MB M6 Rep Power: 16	Largest HP (Less retrictive)=Test Pipes Street legal and somewhat quieter=High Flow Cats Resonaters reduce "rasp" and "drone" noises from opening up the exhaust. __________________ MB Base Model - 19" Volks - HKS Coilovers - Tanabe Exhaust

11-22-2011, 10:54 PM	#2 (permalink)
XwChriswX WFLYIDNNE Join Date: Jul 2009 Location: In The Fastlane Posts: 50,648 Drives: 02 GDB WRX Rep Power: 453	Here's about as good a breakdown as I can make away from home: Stock Cats Suck *High Flow Cats (HFC's)* Either Ceramic or Metallic Core - You'll want Ceramic, last longer, least prone to core ruptures Better flow than stock cats, but less than test pipes or headers 50/50 chance of passing sniffer tests Still retain 'Stock' look for visual tests Mild HP/TQ gain *(Resonated) Test Pipes* No Cat whatsoever Will NOT pass sniffer tests Better flow than Stock/HFCs, but less cleanly than headers or ART pipes Resonated TPs will have less rasp/drone than Non-Res but performance is unaffected Moderate HP/TQ gain *Advanced Resonance Test Pipes (ART* Pipes) No Cat whatsoever Will NOT pass sniffer tests Improved flow over regular (R)TP's Slightly nulled rasp, but still noticeable Slightly more HP/TQ output than regular (R)TP's Long Tube Headers (LTH's) Sex As with (R)TPs and ART Pipes, no cat whatsoever Smoother flow than all previously mentioned parts Distinctive sound, slightly higher pitched yet quieter idle Most Dyno proven gains out of the group. Hardest Install of the bunch, but looks the best when completed. Hope this helps with the basic idea. UNKNOWN_370, MB_Z, Gibby1113 and 1 others like this. __________________ Bonnie - Stage 2, Audio build coming this fall! R.I.P. Abby 3/29/10 - 3/30/14** Last edited by XwChriswX; 11-22-2011 at 10:57 PM.

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