what catback do you use mine i used factory mazda and just removed the muffler and Y piped it aswell as i run a mixture of 91 and 100 octane gotta love race fuel

okay so i gutted my cat(all of it) throttle response is better & i can feel the engine picks up quicker, but now im getting a cel light. so im doing the non fouler mod & i will post on how that works.

1 week and no cel light. non-fouler is working good.

I run 93 in my eight. And yeah, no flames but either way haha... and yeah, the whole non-fouler thing has been tried a whole bunch without any long term success from what i understand. Lemme know if it works though, might be worth pickin up.

Pics tomorrow, maybe a vid too, i get such great POPs now 3rd gear just tapping the gas and a nice flash at night, i just gutted mine yesterday and installed it, had to buy new bolts and washers and nuts because i stripped RPs threaded pipe , suced ass was too late with my air tools turned up. but over all smells better and sounds cleaner. i like that boat smell :) but the stock cat gets way better mpg. over all rp or any high flow replacement pipe is worth is accel is better and revs are, but keep that old cat for smog reasons imo. good tread thanks again.

There is a demand for cat's out there. Trade your working cat for a straight midpipe.

Just gutted converter
 

Thanks to all the comments posted on here i wasn't to sure weather or not i wanted to gut my converter but i know it was getting red hot from driving a long distance then quickly checking under the car to see if it was red and yep just like santa's coat. I didn't have the money to get an mid pipe due to i just got the car completly tuned up and was short on cash so i took a chance and yeah there is an lil bump in power but i lost on top end but i don't go that high anyway and my engine light just came on :scared: after 3hrs of driving which i already know what its going to say :tear:

Ok so a couple questions-

- would doing this decrease the mpg?

-does it increase the hp at all?

- should I do this if the cat is just starting to go bad, but still livable (it is setting off the sensors though) or would it be better for the car to just keep the cat?

-how much louder does it make the car?

Just did this mod to my 8, in addition to doing the seafoam treatment, and WOW, that made a world of difference!!!!! I had 4 CEL codes on before I did this and now they are all gone. Idk whether it was all the seafoam, or all the pipe but it worked wonders. Highly recomended.

You left out the first step; gutting out your common sense. :bash:

well like i said when i gutted my cat it gave me a little bump but it sounds awesome i made a youtube clip so you guys can hear it. It really did increase gas mpg when regular driving but it decrease when at full throttle. but what hp gain don't.
http://www.google.com/url?sa=t&sourc...wbPrHJ7rgCdE_g

Pshhh whats that supposed to mean??? F^%@ u too

so is there a glowing red light around the o2 sensor on the cat is it the cat thats clogged up or is it the o2 sensor that needs replacing????

The red you see is just the hole for the sensor, there's no shielding there, so it's visible.

It doesn't mean the cat nor the sensor is bad, it's pretty much normal.


S

but you see u havent seen the thread i posted my 8 is messing up is shaking severely and well u c the vid

https://www.rx8club.com/series-i-trouble-shooting-95/help-me-identify-problem-please-video-206100/

No I haven't - that's why it is a good idea not to start THREE threads about the same problem.

.....but keep asking until you get the answer you want, by all means.


S

No I haven't - that's why it is a good idea not to start THREE threads about the same problem.

.....but keep asking until you get the answer you want, by all means.


S

errr my car light went off and came back on when the weather changed from hot as hell to cold as fuck but i heard there is something you can buy called an by pass valve or something i'm going to research it and see if it works unless somebody already did

[/quote]It helps me out of the problem, Thanks for your analysis! Nice writing.
 

[quote=toxin440;1725990]1 you will get a CEL2 the idea you "need" back pressure is stupid and a myth. It's like saying you will be able to get more power running if you cover stuff your mouth 25% full of candy so you can get a little back pressure exhaling. 3 you will fail emissions4 your car will stink like assbut if any of that is "your bag" go nuts. A burned out cat is a warrenty issue - i.e. it gets fixed for free. If you want to run with no cat, dont be a lazy ass spend 200 bucks or so and get a race pipe or make one yourself.

yeah i was going to get a mid pipe but i needed get this cat from turning hot right now. i already ordered my hks lega exhaust and and a mid pipe i'm just waiting for it to come in and where i live there is no passing emissions because we don't have it num nuts

dont know if im the only one, but does anyone else have the thread stripping nuts on the header bolts? i started taking the pipe out, got everything done except the header bolt/nuts. i cant get the bottom one halfway off w/ breaker bar and impact wrench. i tightened it back b/c it was getting late last night and noticed the nut stripped the threads clean. not just stripped the threads a bit; no there were no threads left(except at the end where i had given up). wondering if anybody is having this issue or not, im gonna take it up to a muffler shop and have them take the bastard off

Ya those damn bolts. I only stripped one; but, it seems like the ones mazda used are knocked in and use like a counter thread so they don't move easily. I just took off my oem cat pipe cause it was shot and put on that rx7store high flow cat pipe to pass smog. Plan on gutting the old pipe this week and putting it back on and just keeping the new one around. I don't know. Well anyways, ya i pulled up to my buddies shop and we just cut those suckers off. Made one long day but the cars sounds good. Will sound better I think with the old pipe gutted. Probably won't even buy a new cat back. the stock one sounds fine with the messing around with different mid pipes.

Also, anyone with a gutting oem mid pipe... Did you fill the o2 sensor spot with a anything? or left it open? To me i would think to fill it; but, any input is good.

Thanks

What code would the cel would pull up if it was a bad cat.
Thank you guys

Ok... my cat is off... I'm goin at it with a small metal rod and screwdriver through the O2 sensor hole... Tryin to pull it off like Stealth did... Has anyone else tried this? If so, what the hell did you use to gut this bad boy?

I used a 3 foot metal rod and knocked it out through the front opening. Don't go through the O2 sensor hole. You might damage it.