Looking for a good quality high flow cat for the S2K. Don't want a straight pipe. Want an honest high flow bolt up. Anyone....Anyone! I've not seen much dicussion on this one. Expected gains or not?

 

there's tons of companies that make bolt on high flow cats. http://www.randomtechnology.com for example. All you would need is to supply them with the diamater of the pipe on both ends. I really wouldn't expect much HP gain if any, but worth a shot if you have the cash lying around I guess. Remember it is illegal to replace a non-defective cat, of course there are some many ways around that as well.

 

I`d just hollow out your stocker. I`m not a big "high flow" cat fan.


Ryan

 

I believe 1RandyC put in a high-flow cat with marginal results. There wasn't much of a gain, if any.

 

I wouldn't do it... Your car will be signifcantly louder, you could experience sensor problems (which Honda will not fix since you modified your cat), and the gains are none.

I did it to my old '96 Eclipse GST... I got a much louder car, had three sensor malfunctions (I paid 100 each time to fix), and didn't experience any performance gains.

 

I second the opinion to hollow the cat out ... No point getting a high-flow cat when it's gonna be just as noisy, probably less environmental damage and definitely improves acceleration. Makes no difference to the law-enforcement type anyway.

 

When you say "hollow out" the stock cat, do you mean remove the material inside? I read the advice of somebody on a different forum at one time that said to take a coat hanger and bust up the catalyst material inside. Is that what you meant?

I don't see how the car could pass an emission test in California if you do that. I can also see sensor problems and out-of-warranty problems.

 

simple, get a spare cat and you can use it for inspection time, swapping a cat is less than a 10 min thing, and if you have it in the area most owners can rent it from you to do their emmisions then get it back on,its a do it your self job no really hard thing to do, had it on my 96 gs teg.

 

Most cats on vehicles made over the last 5-10 years are already considered "high-flow" unlike cats of the past.

If you can sucessfully do away with it for a "race application" fine.... if not, it's usually better to leave them alone.