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

 

the best flowing high flow cat would be a gutted stock cat with a straight pipe in it.

 

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.

 

HAHAHA I'm trying to go "smog-legal" here. lol

 

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!

 

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.

 

That leaves me wondering..... does any "high-flow" cat pass emissions?

 

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.

 

random technology 3" flows around 600cfm, all the others are in the low 500's.

 

a test pipe is the best hiflow cat...hahhaha

rmr race high flow cat is the best

 

UR hfc +1

 

or you can spot weld the heatshields on your testpipe to give it that "cat look"

 

my helix hf cat never throws a ses. maybe you really need to service your engine?

 

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