Cat removal?

[Wschnitz]

Would I have any problems or issues removing the catalytic converter from my 1987 325ic. I am replacing the muffler and I thought since my car turned 25 I might as well take it out when im under there. Washington state emission cutoff is when it turns 25 I believe.

[MR 325]

No problems other than a stinky exhaust. :)

[CW325]

Will definitely be noticeably louder too

[89 e30]

Stinky exhaust, lauder and you gain around 10hp

[clarkson]

If I want a cat removed, I tend to take them out to the ocean and drop them off the side. They don't come back after that.

[nates 87 325is]

I have no cat I'm my exhaust and it does stink, but the noise isn't anything noticeable

[Cabriolet]

I have no cat I'm my exhaust and it does stink, but the noise isn't anything noticeable

all cars w/o cat's have a "sweet" smell from the unburned hydrocarbons. you dont really notice it if you drive it every day, but you will notice it for at least a week after removing. heck i can smell cars around me that dont have cat's.

[Wschnitz]

Lol thanks for the feedback. I can't wait for that 10hp boost. Should I smoke my tails too? Heard that added 3hp.

[ak-]

Alpina gained 1hp removing their cat.

[Bimmer0761]

best part is you can sell me your old stock cat for $100+

[603Racing]

Removed my cat. I have headers and an old, worn out OEM muffler. Exhaust is kind of buzzy with a hint of drone. Not the greatest sounding, but hey, no cat. Sounds good around 6k though! :)

[nando]

Stinky exhaust, lauder and you gain around 10hp

10 horsepower? I call BS.

there is NO reason to remove it, except for mod list status.

also, no shop will remove your cat. It may not be a WA requirement, but it is a federal one. you are going to gain nothing for your effort, except for an emptier wallet.

[89 e30]

10 horsepower? I call BS.

there is NO reason to remove it, except for mod list status.

also, no shop will remove your cat. It may not be a WA requirement, but it is a federal one. you are going to gain nothing for your effort, except for an emptier wallet.

I went on the dyno before and after I removed it +10hp

[nando]

JUST a cat removal? or did you change other things?

if it was just the cat, then it must have been damaged. Factory non-cat 325i's make 3hp more, at the crank, than a catted 325i. And they have higher compression ratios and more agressive tuning.

to gain 10whp, you'd have to gain like 12bhp. that's 4x as much power as the factory tuned non-cat M20B25 made, with higher compression, better fuel, and better tuning. uh huh.

[89 e30]

Never mind what I said, I forgot that I installed new headers too