i have a 90 GXL

what i want to do is to gut the pre cats and re install them. my problem is i live in cali and im not shure it will pass smog. if i can do this is it advisable to install a new cat(origonal one is perty well shot).the only resson im doing this is i dont have a lot of money to buy an exhuast system. plus i need MORE POWER!!!!!!

well tell me what you guys(or girls) think i should do

thax

 

I live in cali too and the smog tests suck. 20 bucks says your car wont pass smog if you gut the cats that are already on the car. The question you have to ask yourself is when you need to get the car smogged. If its soon then go ahead and get a new cat. If you dont have to get a smog check anytime soon go ahead and gut them and save some money every week/month and get a new one to put on when you have to get it smogged. California is very strict on emissions, so the bottom line is you have to buy a new cat anyway so its up to you if thats gonna be now or later, so go ahead and gut the cats you have if you are sure that they are shot. If you think you can pass smog with the cats you already have then go to a muffler shop and have the guy make you a straight pipe.

 

on the old non dyno tests if everything else is working ok it will pass with just a main cat.

mike

 

I think most moron shops don't even know to look for a pre cat on a rotary.

 

my tII passed with a corksport 3inch downpipe bonez high flow main cat pretty easily. Way under the limit in every category.

 

technically, you should fail the visual if you're not running with 3 cats.

personally, i just put back the stock cats when it comes time for the smog test and then swap back the straight through pipes after i pass

john

john

 

I passed mine in Sacramento CA with the precats gutted and a new main cat.

Gut EM!

A new main cat will do wonders for passing smog in cali.

 

You're my new hero! lol I've got that same setup too for my S4 T2 Conversion I am doing right now. At least I won't have to smog until December next year!

 

bite the bullet, pick up some sort of free flowing exhaust system, and when it comes time to smog ur car, put all ur cats back on... the power difference will put a big on ur face.

 

The 1st cat is there for only one reason. It scrubs the exhaust during start up. It is close to the engine so it heats up fast and begins to catalize. This worked in conjunction with the 3000rpm start up. To heat that cat up fast.

It does nothing after the main cat is warmed up. Unless they test your car emmisions from stone cold car you are ok with just a main cat.

James