Thread: Can i just strait pipe?

Straight. It'll throw codes if no cat.

Can you straight pipe it.. Yes. Should you.. NO... With no res it will sound like butt. If you wanna get rid of the cat you need to get the rear O2 sim.

I've never seen a car throw a code for a fuel filter. If you give us the code numbers we could help you out a lot more.

Originally Posted by phantomplanet89

Well a buddy of mine is a mechanic. He has a high tech computer code checker..

...

Car will run worse with no cat converter.

04+ cant use a o2 sim.

Buy a new cat.

can you run with no cat, yes. should you? if you can still pass emissions without it then why not but you will have to take great care of your engine in order to do this.

fivefingerdeathpunch...would no cat actually cause it to run worse? that doesnt make sense to me since guys buy catless downpipes to get more power.

lol @ catless...thinking it gives more power.

well a cat obstructs airflow somewhat. if you have enough other mods its bounds to make somewhat of a difference.

The WBody cat...betting it isn't clogged like they always do...

Aren't a restriction at all...you'll gain 1~ WHP...if that...deleting it. The main reason most people delete the cat is for sound and the peace of mind it'll never clog.

That's it.

alright, and you did just say that you do gain minimal hp from it so i wasnt completely wrong either lol

The temperature change outside has more gains for your car than deleting the cat.

So no, the only thing you'll be getting is noise.

Yes his car would run worse and get terrible gas mileage.

All 01+ cars use the rear o2 for diag and fueling of sorts in the PCM, if it has so cat all the readings will be wrong and thus dump fuel.

gotcha, see i didnt know that guys lol im still learning like i said in the chat lol

Originally Posted by Fivefingerdeathpunch

Yes his car would run worse and get terrible gas mileage.

All 01+ cars use the rear o2 for diag and fueling of sorts in the PCM, if it has so cat all the readings will be wrong and thus dump fuel.

Isnt that what the rear O2 sim does, it simulates a working cat so the car diagnostics works... 97-00 dont need the sim just have an SES light till it gets tuned out. 01+ have Cat Diagnostics and NEED the O2 sim to go catless or else yes the computer dumps fuel.

Originally Posted by hockeybawler

So then if you get a hi-flow cat would that then effect your gas mileage? or no because you still have a cat on there?

Most if not all highflow cats will still set the SES off because it flows too well.

Originally Posted by Iceman6669

Isnt that what the rear O2 sim does, it simulates a working cat so the car diagnostics works... 97-00 dont need the sim just have an SES light till it gets tuned out. 01+ have Cat Diagnostics and NEED the O2 sim to go catless or else yes the computer dumps fuel.

They say that 01-03 can use the sim, but it doesnt always work, and 04+ cant use a sim, because it wont work at all.

OP's car is 04.

Originally Posted by Fivefingerdeathpunch

Most if not all highflow cats will still set the SES off because it flows too well.



They say that 01-03 can use the sim, but it doesnt always work, and 04+ cant use a sim, because it wont work at all.

OP's car is 04.

I didn't know that it only works on 01-03 cars... I assumed all cars that have the Cat Diagnostics it would work on.