Cat and resonator delete

**94grandprix** · 09-16-2014

The cat on our 03 se is clogged,I have no emmision test here,can I just cut the cat and resonator off and be ok?

**Fivefingerdeathpunch** · 09-16-2014

The check engine light will come on and you might lose fuel mileage if the computer keeps thinking the cat isnt working good enough, and of course it gone so it might.

**SnowTh1ef** · 09-16-2014

Yes, with what he said above. but leave the resonator. You will hate your exhaust if you get rid of it.

**94grandprix** · 09-16-2014

Ok with a clogged cat it will get bad gas mileage also?,it's getting roughly 20 now,I thought without a cat the car will breathe better and improve,how loud will it be without it on?

**SnowTh1ef** · 09-16-2014

If the cat is clogged that can also cause bad gas milage. W/o cat is a very minimal noise increase. If you remove the resonator you will get lots of nasty rasp and it will sound bad. Remove the cat, leave the resonator.

**94grandprix** · 09-16-2014

Ok thanks

**lewis1952** · 09-16-2014

That cat is worth about $150 to $200 dollars at salvage around here. ( Tulsa )

**Grimsin** · 09-16-2014

3.1l sound a lot better then 3.8 so taking the resonator off might be ok

**94grandprix** · 09-16-2014

Ain't worth anything here I don't think but gonna try to scrap it anyway

**SnowTh1ef** · 09-17-2014

Cats any where should be worth around $50 at the very least

**Scottydoggs** · 09-17-2014

my local scrap yard no longer buys cats.....they offer iron scrap weight. aka nothing.

**SnowTh1ef** · 09-17-2014

bummer. I usually just throw them up on CL or the local facebook buy/sell and some random guys will pick them up for anywheres from 50-150 for cats.

**blueguy** · 09-17-2014

You can just pick up a universal Magnaflow converter on EBay for $50-75 bones.

Or, get a bolt-in downpipe from Milzy if they're still in business...they make 3100/3400 stuff.

If you went that route, not only would you keep the MPG's...but they'd probably improve along with getting better performance out of it as well.

**industrialfish** · 09-17-2014

Originally Posted by lewis1952

That cat is worth about $150 to $200 dollars at salvage around here. ( Tulsa )

Can I sent you my cat and we'll split the money? They are worth like $30 here.

**94grandprix** · 09-17-2014

Lol that's what I was thinking

**Badgers4life** · 09-23-2014

The only problem is that if you delete the cat without deleting that second sensor on your computer, you could throw a code because it's an o2 sensor that sits right after.. It may also effect your fuel mixture.

**94grandprix** · 09-24-2014

How do I delete the sensor,I thought I only seen 1 which was at the firewall,don't they make something to plug in it to make the computer think it's there

**Scottydoggs** · 09-24-2014

you have a 03, you need the rear o2 in your years. cant delete it.

but you can use them o2 simulators to fake the sensor out.

like these. https://www.google.com/search?q=o2+e...82363564876030

**Russosaur** · 09-24-2014

Thought those 02 sims didn't work on 01+ because the car would be stuck in cat diagnostic mode and burn a crap load of a gas and whack out your fuel trims.

Sent from BFE