I am having a hard time finding a 3” cat anywhere, and ones I can find don’t seem to be rotary specific. I want the best flowing, good longevity CAT I can find .. but it still has to be smog able. Can anyone help me out?

-Robert

 

Mike(j9fd3s) used a 3" CatCo for his 20b. He was complaining about the limited options too. No feedback on it yet though. It's only been on the car for a few weeks. It's actually smaller than the stock FC one. Good luck and post feedback when you finish it. I'm also looking to run a 3" cat for streetdriving.

Steve

 

Ya, I gotta smog this thing again in Sept. The visual is not a worry .. but I do have to pass the sniffer. Plus it's sooo F-in loud now that I can't drive it past 10PM cause my neighbors will freak. The noise is really starting to get to me.. so I am hoping to quiet it down without to much power loss, and be able to smog it in Sept without to much F-in around.


I hope someone has idea's, but I will let you all know if I find anything .. I am going to make some phone calls tommorow.

 

I've been running a magnaflow (car sound) 3" with air hookup for a while.

no idea what the inside is like or if it's holding up since it hasn't been off. but I've passed emissions 2 years in a row with it.

 

This is a good thread, I've got an RB downpipe and presilencer right now. Which is 2.5 ID (which is plenty IMO). They make a presilencer/Cat replacement pipe which is also 2.5 ID and claims to take alot of the sharp exhaust notes out.

I was looking on summit thinking about getting something legal for MD emissions. When you mentioned Catco I thought damn, that's a good idea.

I looked up this model3 ID)
http://store.summitracing.com/partde...art=CTO%2D2907

And thought I could just take my old presilencer in to an exhaust shop with that and just have them weld flanges/pipe on to be a direct swap.

I think i'm going to do this (with the 2.5 ID model) mainly because it would be a quick swap between the two for track days, it will probably knock a little noise out during street/daily driving and, it's 50 state legal for emissions.

 

Not to chap anyones hide here, but I have heard Catco is more or less a 1 year cheap Cat to pass smog with your Honda type of cat.

I mean a 3" Cat for $66 ? When a 2.5" Bonez (rotary specific) cat is $250! I mean what is the diference? I assume the bonez has to be much better made, but they do not make a 3"

Money is not an issue, I want somthing that will not burn up, or clog, or fail a year after I put it in. I am just awfuly weary of a $60 3" Cat ... plus I wonder how the flow is on a cat that cheap.


know what i mean?

I did find these guys;
http://www.randomtechnology.com/universal.html

Anyone heard good or bad about them? I sent them an E-mail to ask about rotaries .. heat Etc. and there products.

 

Well, it does carry a 25k mile warranty, which isn't much... but it's enough for me, that doesn't drive it daily.

I look at a catalytic converter the same way any mechanic or dealership would. It's a wearable item. And it's not a "Saftey" wearable item, like brake pads or shocks are. I would rather slap it in to pass emissions every two years rather then have a perminant restriction in exhaust flow (compared to a non-legal catalytic presilencer).

 

random technology carries the main cat for fc...but the in/outlet is only 2.25'....please explain this to me...

 

well thats 25K on a normal piston powered car i would assume. Not to many piston cars shoot 2' flames out dual exhaust under boost. I just think it would burn up in no time at all if it's not really well made. I plan to use this as a permanent solution to my sound problems even if I loose some power. The fines here in CA are outragous if you get caught without a CAT ... it's just not worth the risk to me If I can find a really good flowing legal cat .. that will hold up under heavy weekend driving.

 

Thought I would bump for more ideas. I got an E-mail back from random tech .. and they asked if I needed a air pipe on the CAT, I replied yes, and they have not back to me yet.

 

Not to steal your thread but I have a quick question: Do you guys think a 3'' exhaust is needed on these cars? I know with DSMs 3'' is needed or you will be restricted if you have a lot of mods, but is it the same way with the RX7? Or is 2.5'' sufficent? Cause I see a lot of 2.5'' products at RX7-tailored websites but not too many 3''. I know bigger is better but is it worth it? BTW I will have a S5 TII. Thanks!

BTW I have heard good and bad things about the catco 3'' cat. I've heard it doesn't last too long but it flows good and passes emissions!

 

Understandable. I could never live in california with all of their emission laws and the such.

-Mike

 

DSM, your scaring me. nothing aginst them, but a DSM cannot even near equal the output of exhaust flow of a rotary .. for one they have valves, for 2, the only DSM's I know of are 4 cylinders. Plug in #3 here ... back pressure is required for a turbo charged piston vehicle to not burn up the valves.

Bigger is better, and a TII not modded will do very well with 2.5"-3" wide open, a modded one will do even better with a 4". The more flow the better, with no back pressure danger on a rotary.

 

Well first I was talkin about the turbo ones (yes they are all 4 bangers), and second a lot of people ran 3'' from dp to muffler and from what I read it was needed. Here is a thread with tons of people running 3'' exhausts: http://www.dsmtuners.com/forums/show...threadid=84871

Heres another thread where somebody regretted buying a 2.5'' exhaust only to buy 3'' later (2nd post): http://www.dsmtuners.com/forums/show...&threadid=6465

OK here is a thread where it tells that no backpressure is needed (it is said twice) and also that 3'' is the trend: http://www.dsmtuners.com/forums/show...threadid=81119

See I know what im talkin about !

 

Well folks I have decided. After quite a few E-mail corospondences with Random Technologies I have decided that they no doubt know what they are talking about, and make the best product on the market for my particular application.

Here is the CAT I have decided to go with;

http://martelbrothers.com/customer/p...00&cat=&page=1


I will keep you all posted on the results after I install it in a couple of weeks. Waiting on my new welder at the moment.

-Robert

 

No air tube?

 

ya, they told me that model had one. I think that is just a genric picture.

 

Rpeck,

If money is not an issue for you you could probably check the R-magic FC specific 80mm cat. I do not know what is the price on that one but you should check it.

http://www.aerodyne.net/rmagic/exhaust.htm

 

Random is the best. I've used them before when I raced toyotas. They told me a cat for my FC was going to be like $450 or some crape like that. $200 is a much better price.

 

Yes,you need to get the information,and part numbers from random...but purchase from one of there distributors.. you will get a much better deal. They way over price in order to not under sell there distributors.

-Robert