Im completely gutted from 1st cat and straight pipe were the second cat is. Could i put the original cat on and pass emissions with 1 cat? (georgia emissions) or would i be better of with 1 hi flow cat (w/ or w/o O2 sensors? i dunno) 2.5 inch i suppose is the size to go with

 

What are the emissions in GA? In TN on the 96+ all you have to do is not have a CEL on......on the pre-96 models they do a sniffer test though.

 

i have a 93 sc so yea they do the sniffer test. and i failed it. I passed before i went gutted.

 

yah we get the sniffer in GA
and my car had trouble with the NOx emissions on my car.
i dont know how to fix the problem thats why i moved my registration to an area where there is no emisions requirements

 

gota love no emmisions testing where I live in colorado.

 

is the 1jz in already or u still stock? Im wondering if i should be ok with the 2nd cat only since i passed no problems b4 the mod. But thing is will it pass wit only 1 cat

 

Use a 3 way Magnaflow High Flow with a 3 inch opening to go on that 2.5 inch pipe. Welds just right and you shoud have no problem. Should not even be a problem with O2 sensors.

 

so one 3in magnaflow should do the trick? I can pass with 1 cat?

 

When/if you get that answer, please do a few of us a favor and post your numbers and pass/not passed...thanks

 

I have an RX300 that has that exact configuration (the precats and the cat went to heaven, one via bad gas and the other from road debris) and being in Mexico with an American-plated car, I DON'T CARE.

Nevertheless, I have had my car tested on emissions equipment and it passes even with bad gas and high altitude (with less oxygen) and Mexico City is just about as strict as California (except for the bribery down here )

The 3-way is supposed to the do the work of the precats. The precat(s) are just to help reduce emissions until the main cat has had time to get warmed up.

 

no im still stock you guys will be the first to know when it goes in. but it is hard for me to say because i have 189,000 miles and i doubt the cats have ever been replaced.
for what its worth the guy that did the test that i failed told me he sees that problem alot with lexus over 100,000 miles, im not sure it i believe him.

 

nah either ur cats are gone or they aint doin sumthin right. I was around 120k wen i got inspected and i passed. Went back after i gutted it and failed. Now i guess ill get a cat and see what happens. Since the pre cats are used cuz the main cat needs time to heat up. So i guess 1 cat will do juss run the car hot and get inspected. They do put a fan on the damn car which can actually defeat da purpose of using heat to reduce emissions

 

no the point in heating the car up is to get the cats hot not the engine so the fan makes no difference. And the reason you want the cats warmed up is because the metals in them undergo a chemical reaction which is what cleans the air, and this reaction takes a certain amount of initial heat before it will begin to work. thus the reason to get it hot, which is totaly independent of coolant temp.

 

oh ok gotcha... so i should be ok with 1 cat as the main and the pre cats gutted