Need emissions help, which option to go with?

**tbrown1309** · 12-18-2013

I have an 02 gtp coupe, basic mods n bolt ons. Cai cone, upgraded pcm, bolt on downpipe, slp exhaust, headers, msd ign coilovers, ram air hood, my SES soon light is on with the dreaded po420. Tested and double checked and the catalytic coverter is fried. It was stock, so I assume that I shouldnt go with another one. There are many universal cats by magnaflow and flowmaster but does anyone have a good opinion on which one to go with or what to do? Ive seen dummy plugs but dont know 100% how those work either. Any advice helps! Thanks!

**Fivefingerdeathpunch** · 12-18-2013

Most highflow cats will set that same code. They flow too well for what the car wants.

You'd have to spend between 100-200 bucks for a higher quality cat converter to keep the light off for good. Those "dummy" plugs, emulators do not work on 01+ cars if I recall correctly.

**Scottydoggs** · 12-18-2013

walker catted down pipe would be the closest thing to stock.

or get a zzp catted pipe and the do the fouler trick to fool the o2 sensor.

**tbrown1309** · 12-19-2013

So I cant try the just fouler trick with the bad cat?

**Scottydoggs** · 12-19-2013

your cat is clogging up. it needs to get changed.

the fouler tricks the pcm into thinking a high flow is not high flow.

**indygrandprix** · 12-19-2013

Will the fouler trick work if the cat has been completely deleted.

**Scottydoggs** · 12-19-2013

not sure really. it may on the older models.

**tbrown1309** · 12-19-2013

Im just so short on money scared If I put a high flow on that it won't work. Any legit suggestions where to start first?

**REDCRAPGP** · 12-19-2013

Originally Posted by indygrandprix

Will the fouler trick work if the cat has been completely deleted.

Sure will worth a shot. Got rid of my po420

**tbrown1309** · 12-19-2013

What year was it?

**REDCRAPGP** · 12-20-2013

This will be for my 04. It's like $7 try it!

**ItHurtz** · 12-20-2013

fouler worked on my mazda 3, double stacked though. all a fouler does it move the 02 further away from the exhaust.

**Daheazle** · 12-20-2013

The fouler would probably work and is cheap enough to try if it doesnt work its not a big loss. You could also get or make an o2 sensor simulator. They work on damn near all cars that dont have an air pump. If your cat isnt plugged you dont really have to replace it if your only goal is to turn the light off.

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**tbrown1309** · 12-20-2013

I will try the fouler since it's so cheap. Say a prayer for me! Lol thanks for all the help guys
! Any other suggestions are. welcome to

**Explicit_Spade** · 12-20-2013

So your cat is clogged, but you're not going to replace it? Are you aware of the negative impact a clogged cat can have on your engine?

**tbrown1309** · 12-20-2013

Its not that im not going to deal with it or am ignoring it, but is dealing with that the most cost effectice way path to go down
Until I pass emissions and get money replace it? Aftee I pass ill probably cut it out and replace with high flow and foul it

**Daheazle** · 12-20-2013

Just because he has a P0420 doesnt mean the cat is plugged. Usually when they are plugged you wont get a P0420 anyhow. More misfire codes and map/maf codes

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**tbrown1309** · 12-20-2013

Thats what I was thinking. Plus its not true dual its single to Y pipe and the exhaust flow is pretty great

**tbrown1309** · 12-20-2013

Although being perfectly honest I have been having random and intermittent map/maf codes and hesitations while accelerating and erratic idle sometimes dying. All intermittent like right now it only dies once in a great while at idle it used to have to be in neutral and gassed to stay alive

**tbrown1309** · 12-22-2013

...what?

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