Cats?

[ssbroly]

Just out of curiosity, not that it ever killed the cat, but has anyone completely removed their cats? If so, what kind of gains or losses did you run into?

 

[panda24619]

i have seen some on youtube that removed theres. but the computer will read something is different. and the check engine light will turn on. but it is a lot louder! im not sure about ohio. but i know in some states if you remove your cats you could be talking impounded or at least a ticket.

 

[joezek]

I haven't messed with them on the Expedition yet. But I did on my explorer. There was a massive gain in mpg, and acceleration on the highway was much much better. I was getting 24 mpg on the highway with the cats emptied. I finally replaced them to quiet it down so I can sell it, and the mpg dropped to 18-19, plus I have to drive about 68mph to even get those mpg.

My goal on the expedition initially is to replace them with high flow racing converters. Maybe some day I can make a test pipe setup with flanges etc. so that I can try installing and removing them for comparison.

 

[ssbroly]

We don't have e-check anymore, since most emissions are controlled by the ECM now. As far as I know I won't run into any trouble. I did figure the computer would read something was wrong, but still, those annoying things are boggin up 10-20 horse, easily.

 

[panda24619]

yeah they really are. i wish i cold remove mine but i live in CA. so theres no way i could. Just remove yours and see how you like it. if you dont then replace them with some aftermarket ones.

 

[ssbroly]

Yeah, you're right, I guess I could alway gut 'em. Have a suspicion they're clogged anyway. If I endup gettin to it, I'll post the results. Thanks, again.

 

[walnuts4x4]

I have my rears deleted... no problems and defiantly improved power and sound is awesome... also have true duals with flowmaster 40s... been a awesome setup but thinking of removing 40s and going straight piped with a X-pipe in the spring

 

[KWT2000]

i have the rears deleted also no check engine light either and passed emissions yesterday. im using the factory Y pipe with a glass pack and dual tails sounds great and huge gain in take off power

 

[panda24619]

damn to bad i live in Cali. wht ever was on stock must stay. unless its a new muffler. thats about all you can do. 4 cats means 4 cats. manifolds mean manifolds. no headers no cat deletes. and no stright pipes. but im thinking about cutting my tail pipe. its already crushed from the axle hitting it. i wish i could remove my cats and at least run a true duel with no cats.

 

[ssbroly]

When you say deleted, did you gut them, or replace them with a straight pipe?

 

[walnuts4x4]

removed and replaced with regular pipe... I believe KWT2000 did the same as me