I'm looking at an '87 gxl I want to buy. The owner says it's completely stock and the exhaust looks stock, but there is only one cat. I thought all NA's came with three cats? Did '87 gxl's only come with one?

 

Nope, its not stock. They came with one cat, and two precats. Precats only function for cold emissions, though.

 

What do You mean by Cold Emissions? When the car is Cold? or something else.

If so then I should toss my precats since I'm in Arizona.

 

**** cats.

 

Join Greg and Rpeck and try to rid the world of these vile creatures...


Oh, you mean catylists. NM Then

 

cold emissions? oh and if i got a bonez dual high flow cat setup what would i do about them precat things? im trying to stay california legal and all...at least for a couple years anyway :P

 

if you run cats you ain't no dogg

 

I'm curious about this as well. Could I replace all three cats with a single C.A.R.B. certified high flow and be cool under Cali big brother emissions?

 

will a bonez dual high flow cat setup pass emissions in cail because i am thinking of buying it

 

The two precats operate only under start-up, to remove cold-engine emissions. They do not function much during operating temp, and removing them will not affect normal running emissions. Since there is no way to test cold emissions, there is no worry.

You will pass emissions with a bonez set-up, however, keep in mind that you may fail visual if you do not have all three cats in place.

 

embrace prison

 

so if i want a higher performance exhaust, but i still have to worry about passing emmissions, whats my best option?

 

bump

 

This:
http://www.rx7.com/cgi-local/2catalo...cat=4&part=100


or this:
http://www.rx7.com/cgi-local/2catalo...cat=4&part=110

 

will is pass in ca too

 

Both will pass CA emissons, however if you go someplace that really knows RX-7s and the FC in particular you may not pass the visual on a series 4 NA car. But to the average smog shop, you will not have any problems passing.

The dual cat is also CARB legal in CA on series 5 cars.

 

why is it legal on s5 and not s4? i have an s5 but im curious none the less. and do you live in CA icemark? if so what do you run cats/muffler/piping.

and are there laws that govern muffler stuff for CA? ive been here 3 years but havent done any car modifications or actually had a car here till recently.

thanks

 

Because the series 4 NA cars have 3 cats, while the series 5 have only 2.

Yes I live in CA. I use a custom down pipe and Bonz turbo cat and the stock cat back (because I haven't been working and don't have the funds saved up for a new exhaust yet). I will probably go with either the RB or Corksport, eventually. Since I have a 'vert noise is a bigger issue than on a Coupe.

 

do you like the bonez cat and do you think it made much difference?

 

I'm actually going In an hour to swap out my s.s hi-flow cat with a s.s straight pipe. Shame on me.

 

It hard to tell, since it went in when I put the 13BT in. I guess what it came down too was that I didn't trust the stock NA cat and the HI-flow Turbo model replacement allowed me to meet emissons and was cheaper than a new OEM or OEM knock off cat. See, I have the double wammy of having to meet NA emissons with a turbo car now.

And as many on this board know I am a firm (and often outspoken) believer in meeting the emisson requirements in CA (or the area you are in) while still having decent HP. Responsible performance I call it, so unlike Silverrotor and others, I am against ripping out all the cats or other emisson controls on a street car so that my car stinks and pollutes the area for a couple of extra HP. That meager extra little bit of performace is just not worth it in my eyes. If you need to take polluting short cuts on a street car to win or whatever, you got the worng car IHMO. Buy something that has the HP you need without ******* up the emissons system.

 

can you use the dual cat on a s4 and pass in ca or it is only CARB legal on a s5

 

as I posted above:

 

**** cats again

 

Uhmm... isn't that cruelty to animals?