I'm thinking about getting a high flow cat but can't decide which one to get...
what would u guys recommend? UR?? Helix?? Works?? something else???
just wanna hear u guys' opinion. greatly appreciated!!!

 

I have Works 3"HF, the fits is great. The main thing is to make sure it is a direct bolt on, I don't like when you have to weld. I had a problem(boost leakage) at first but it was a gasket issue, I ended buying a Gredy full 3" donut gasket which happened to fix my problem.

 

I have the Ultimate Racing which is cheap, a direct bolt on, and works fine. Might not have the bling of some of the others but it works great.

 

you might wanna read up on the laws about changing out your catalictic converter before you slap a new one on there.....unless you plan on using that car for racing only. just some food for thought.

 

hey whats the advantages and disadvantages of a high flow cat??????

 

HFC gives more flow than stock cat (it should), while polluting slightly more..., but less than a test pipe. It also depends on local laws and your view on the environment.

 

any check engine light??? thanks

well... shouldnt it be ok since a high flow cat is still a "cat"........?

 

i have the works hfc...i have no complaints...love it

 

no check engine light problems w/ the hfc on my end..not too sure bout others

 

Not really, it depends on the state. When i lived in california I remember the law being something like.

You can not alter/modify the factory stock exhaust system or catalyst converter for any reason unless the stock exhaust is damaged and/or the car is 10 years or older.

It is a very strict law in CA. I don't think you can touch the exhaust at all unless it is damaged or 10 yrs old. If it's damaged you need to get it replaced with another CARB approved product.

But do some research in the state you live in, i'm not too sure what it is.

 

My Helix HF cat would throw SES lights every day or two right off the bat. Until I installed the eletrical simulator. Kinda sucks because I would have paid less than half the price for just a test pipe if I had known that ahead.

 

I have the UR high flow cat and its great although it does set the CEL for catalyst inefficiency. I put one spark plug anti fouler in for the mechanical CEL fix and that took care of it.

 

Even if it is damaged the only OBDII vehicles currently allowed to use an aftermarket cat are certain trucks.
When my sisters cat went bad on her 2002 Lancer we had to have it rebuilt. I called every muffler shop in the phone book and they all said the same thing, that they could put another cat on and that it should pass the visual inspection but the factory cat is the only one that is technicaly legal on OBDII cars.

 

i have the ultimate racing hfc its a great piece and its afforadable

 

lucky i dont live in cali... well i live in illinois and they have emission tests every 2 years... i think cali definitely has stricter emission law than in illinois.. but i'll still do some research.. i saw.. or smell lots of people driving without a cat so i think it should be ok.... a test pipe is definitely the best way to go but i live in a townhomes community and my neighbor has little kids and babies and i always get home late at night so i dont wanna bother them... also my evo is my daily driver... wanna keep some comfort for myself

Thanks for the response everyone!