It will all come out clean, the ceramic is held in place by fibre around the edge, once it's broken up, the fibre falls out too.

Silverguy is right, don't start this unless you have a couple of days free......

As projects go, this rates up there as

".....**** - this IS impossible!"

or

"Jeebers, I wish I'd never STARTED this ****!"

You should also have the right size (metric) thread-tap on hand to clean up the sensor hole, because you WILL smash the threads.

S

 

^Yup and thats why I was picking this apart. I want to know ex what the hell I'm doing befor I start. This way I know how long it will take me to do the job. This will have to wait till another time.
I thank you all for the great info and being patient with me. Now I just need some advil.

 

It was a conclusion I drew from a few observations I made from your posts (your, as in forum users). I'm just wondering WHY you'd want to do this. Does it make the car go faster? Does it make it sound better?

If it makes it go faster, that means that the more catalyst you use (ie, the more you drive), the faster it goes. Sounds ridiculous to me.

Which brings me to another gain: audio. If you want better audio, get a MazdaSpeed exhaust.

Yes, its my first rotary. However, this concept of a "quiet" RX8 is completely alien to me, since I have a MazdaSpeed exhaust, and you can hear Rena coming before you ever see her. Not to mention that the purr of the rotary + MazdaSpeed exhaust is just so freakin orgasmic I see music in the stereo as an obstacle (hence I turn them off and just listen to the symphony that my right foot tells the engine to play. IT'S BEAUTIFUL!).

 

It sounds ridiculous cos it ain't so... During normal operation catalyst gets "burned through" (the chemicals are used up) but the solid stuff still stays to impede the exhaust flow. The point of this to remove this extra "stuff" that some people believe serves no purpose (I am still not convinced).

As for power gains, it will not be anything dramatic, but if any exhaust mod will yield power this one certainly will. Not sure how this would stack up against a high-flow cat, though...

 

Well I'm done All StealthTL stated above is TRUE! I was thinking what the **** have I started! Could've been cruzing around or watching a movie. Cars all put together but its to late and I'm too dirty & tired to start or drive my car. Will report back tomorrow.

Estimated time to complete 29hrs with long breaks in between. My breaks were needed because two times I almost just wanted to punch-out the the whole cat material out from the front end which would have made this job a 1-2hr job.

***If you have the extra cash laying around dont do this mod, just buy a supercat or something. But if your short on cash or saving for something else(Like me ) maybe this mod maybe for you.****

 

I have really been thinking of doing this mod.... unfortunately, I lack the time AND patience to do this so... anybody wants to do it for me?

Maybe at SSX.... just maybe...

 

Silver_Surfer, See thats why I was all questions on picking this apart for the ones like you and me that dont have 3-4, or more days time to complete this mod.
I was going to do it but after going over what has to be done; Time vs money, well money wins. I'll just buy a full exhaust system.

 

That's a good point, anyone done just that and turned it into a CATless midpipe w/giant resonator? It certainly looks like the OEM resonator may be more effective than the small diameter things on some midpipes. Wonder if it's enough to quiet it down (to 90db) when using a CAT back exhaust?

 

Results: No cell Revs alittle faster, butt dyno feels alittle better. I would say from the way people describe the gains are about the same as a AP underdrive pulley but with alittle more deeper sound(I like!) I 'm not going to dyno it but I would guess its about the same or on par as a A/M supercat.

If anyone is going to do this mod buy a 4ft section of springsteel rod(I used my expensive nylon coated dewey rifle cleanning rod ) After stroking the rod back & fourth(Having sex with my cat with no climax ) for awhile I came up with an idea. I bent the front 1.5in section to about 75-80 degrees, pushed the rod into the back of the cat, hooked the other end to my drill and "Roto-Rotered it. Made quicker work.

 

Yeah, I hear you!
I striped one of the front exhaust studs taking the cat off. Was a bitch to change. I did save a bunch(Geico) of cash but would I do it again? I just dont know.

 

Well considering a supercat is about $400 new, it may be worth the trouble for someone who cannot devote unlimited funds to their car. For me it comes down to the fact that I have about $500 to spend on my next mod, and this way I can have a high-flow cat AND a nice cat-back.

PS- didn't get to it this weekend. Silver- did you take any pics?

 

Sorry no pics. But pics really wont show anything except rods sticking out of the cat. One tool I used that really helped was a 3-4 ft stainless rod. I had it shaped into a straighten Z with one end sharpened to stab and pry at the cat material through the 02 hole. The other end(shorter was my handle. The pointed end of the rod had to keep being reshaped as working deeper into the cat untill reaching all the way through. At first I was only working from the 02 sensor hole but the **** had nowhere to go so I had to figure a way to make a hole all the way through so the stuff would fall through. Thats where the springsteel rod came in use.

 

Thanks man- I'll give it a go when I put my new catback on.

 

[QUOTE=Silver_Surfer;2038810]Results: No cell Revs alittle faster, butt dyno feels alittle better. I would say from the way people describe the gains are about the same as a AP underdrive pulley but with alittle more deeper sound(I like!) I 'm not going to dyno it but I would guess its about the same or on par as a A/M supercat.


***Update*** I just got finished installing my AP underdrive pulley. I had more gains with the cat mod than the AP underdrive pulley. Heck, felt little to no gains on the butt dyno. Wish someone could do a dyno test on both cats.

 

alright to be honest i have no idea what you guys are talking about????first of all can someone tell me where i can get info on how an exhaust works....and how it differs from a straight pipe, and how it differs from a hi-flow,and what exactly a midpipe does and what exactly is a muffler then???im still in the process of understanding fast cars, i wasnt really interested in how a car goes fast untill my friend got an evo8, then i startd to ask myself how does this work, so i have very little knowledge on how the exhaust systems work....can some fellow 8 drivers give me some helpful info, hints, and advice....

 

Go slow and research! Dont do any mods/changes that cannot be reversed and you'll be OK.


And DONT DO THIS MOD!!!!!!!!!!!!!

 

so, exactly how much more power/better mileage am I gonna see if I fornicate the cat converter with an Iron rod, sorry if this is old but I'm a noob

 

To be honest. Very little!

 

it will come in handy also if you supercharge! it also helps the cat run cooler if you track your car.
olddragger

 

True on the supercharger, but if you have that big a budget you might as well buy a high-flow unit and spare yourself the headache... or just get a midpipe...

If you do alot of tracking, a midpipe would be a good investment also, even if you only put it on for track days.

Not saying don't do it, just think of the options

 

already did it and i have a midpipe for the track----we think alike
OD

 

Mines goin bye-bye this weekend, hope I don't catch any flak at the shop here on post...


I kinda miss the muscle car...it was so much more straight-forward


Thanks for all the info guys

 

i plan on doin this tonight when i get off of work ... i hope to do it about four or five hours with the cut in two and weld back together method... any suggestions before i dive in ?

 

Using the chop-n-gouge method loses one of the advantages of this method - undetectability. The weld will be fairly obvious, unless you can get the heat shield off/replaced in good shape.

 

unless he cuts and rewelds on the original seam.