Guys/gals, I recently had a hose job and injector rebuild done. Turned out my main cat is clogged. My only mod. is an HKS downpipe. I looked at a new Mazda main cat. and they cost over $1000!!!! WTF??!!! I need a new cat. and was thinking about a Bonez Hi-flow but I'm aftaid I will run lean....any comments or suggestions? Ofcourse I could get a piggyback or PFC, but those are currently out of my range for now. Thanks.

 

you will be fine if your only mods over stock are the dp and high flow cat. just make sure your next mod is a remapped ECU or PFC.

 

Check your local laws regarding emissions equiptment. I know here in NY they have to extend the warranty to 10 year/100K miles (I think... maybe 6/60). I'm sure CA has something similar.

 

I think your concern is going to be boost spikes. Get a boost guage with it.

BTW: I think it's illegal to install them, but you can buy used cats on ebay for pretty cheap.

 

JR is correct...if you have a 95 you might still be in luck..mazda's warranty is 7/72 for emissions I beleive...from original date of purchase.

but plan on getting a hi=flow...for the cost it's worth it

 

If you are asking about smog-law safety: The Bonez hi-flow is smog legal, and will pass the visual. The DP will not pass the visual.
If safety for your car...depends on your mods, u need to make sure ur ECU is up to the task.

 

You shouldnt boost spike with only a dp and high flow cat, especially if you have the stock cat back. Like previously stated, make sure you get some sort of ecu upgrade before throwing more than 2 mods on.

 

here is another option you can do which i plan to do in the very near future, just get a midpipe and use restrictor plates to control the boost, just get them made at your local fabrication shop out of gasgets or some very thick metal. that should do the trick. ill keep you updated when i do it. goodluck

BTW: f*ck the emmision test, blowing flames is sooooo much cooler!!!

 

Thanks for the replies guys..I think I'm planning on buying a used main cat from forum members here. I also put up an ad on the partstrader.com. To be on the safe side, I think I'll go with a stock main. cat.

 

jr...I've never heard of such warranties...where did you here that? I doubt they'll give a new one anyways.....since I have a DP. installed and the chassis now has over 100K on it..BTW, its a '93. Thanks.

 

Here in NY there is a law requiring all manufactures to extend the warranty on emissions equiptment. I'm not 100% sure what the length is, but Johnny is saying 7/72 from Mazda on emissions, and I think here in NY they go as far as 10/100. I'm sure CA has similar laws, but it sounds like they wouldn't help you anyway.

 

Here I just found this:

http://www.epa.gov/otaq/consumer/warr95fs.txt

Looks like it's a federal law and the coverage is 8/80 on all 1995 and newer cars.

 

Alright well now you guys have me worried.
I bought by 94 with a blown motor for a good deal...
I am having Dave at KD rotary rebuild the engine, plus a little bit of street porting action to go along with it. Add to that the M2 intake and downpipe I'm going to put on it...
So do I need to be WORRIED about running to lean, or can I get away with it just don't add any more mods until I get a remapped ECU?

I have some time to think about this issue, I just want to be ultra safe!

TIA

 

Hmm, intake, DP & streetport.. your pushing it, but if Dave is doing it I'm sure he'd tell you if you really needed an ECU. Just make sure an ECU is your very next mod.

 

Yeah that's what I was thinking... I'm just being **** retentive on this project. But then again aren't we all (on this board at least)!

;-)

My biggest nightmare, is that I get everything back together in the car, and like the thermostat sticks or something like that and the engine over heat's and pukes! or detenates

 

Mathew, just keep the boost at 10 psi with the streetport, dp, intake setup, and you will be fine. turn up the boost and youll be pushin it.

make your next mod an ECU.