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Best Hi-flow Cat?

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Old May 17, 2005, 08:40 PM
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Best Hi-flow Cat?
Hey, I've used the Helix 3'' Hi-flow cat before, and went to test-pipe. Now I'm thinking about going back to a hi-flow cat.

Can you guys tell me what is the Highest-flowing Hi-flow cat out there? Also, is there a difference in performance between UR hi-flow cat and the Helix Hi-flow and others? Thanks
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Old May 17, 2005, 08:42 PM
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the best flowing high flow cat would be a gutted stock cat with a straight pipe in it.
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Old May 17, 2005, 08:42 PM
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you didnt like the helix? i was looking to get that one
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Old May 17, 2005, 08:44 PM
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Originally Posted by JSYEVO
you didnt like the helix? i was looking to get that one
No the Helix Cat is Great, but I'm just wondering if there are higher-flowing ones out there.
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Old May 17, 2005, 08:45 PM
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Originally Posted by bdking57
the best flowing high flow cat would be a gutted stock cat with a straight pipe in it.
HAHAHA I'm trying to go "smog-legal" here. lol
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Old May 17, 2005, 09:32 PM
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I heard that the random technology cat is the best on the market. Damned expensive though, but i guess u get what u pay for!
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Old May 17, 2005, 09:38 PM
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Originally Posted by JSYEVO
you didnt like the helix? i was looking to get that one
I like the look and finish of my Helix, but it throws SES light every other day. And I can't do the sparkplug anti-fouler fix because it doesn't fit (hits the underside of the car). Am going to do an electrical o2 simulator next.
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Old May 17, 2005, 09:39 PM
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Originally Posted by johny719
HAHAHA I'm trying to go "smog-legal" here. lol
That leaves me wondering..... does any "high-flow" cat pass emissions?
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Old May 17, 2005, 09:54 PM
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helix looks like a good one.

best one is just to by pass all the highflow crap and stick a 3" pipe in there straight.
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Old May 18, 2005, 12:04 AM
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random technology 3" flows around 600cfm, all the others are in the low 500's.
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Old May 18, 2005, 01:03 AM
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a test pipe is the best hiflow cat...hahhaha

rmr race high flow cat is the best
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Old May 18, 2005, 04:18 AM
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UR hfc +1
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Old May 18, 2005, 04:32 AM
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Originally Posted by bdking57
the best flowing high flow cat would be a gutted stock cat with a straight pipe in it.
or you can spot weld the heatshields on your testpipe to give it that "cat look"

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Old May 18, 2005, 04:48 AM
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Originally Posted by madpacket
I like the look and finish of my Helix, but it throws SES light every other day. And I can't do the sparkplug anti-fouler fix because it doesn't fit (hits the underside of the car). Am going to do an electrical o2 simulator next.
my helix hf cat never throws a ses. maybe you really need to service your engine?
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Old May 18, 2005, 12:33 PM
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Originally Posted by madpacket
That leaves me wondering..... does any "high-flow" cat pass emissions?


I use UR 3' hi-flow cat......and i pass emission in NY
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