Cat. Converters Replacement - United Bimmer Community

**Rooz** · 11-04-2005, 06:02 PM

Ok, I have this issue with my cats, they rattle like crazy....

The sound that they create is just getting to the point where I can't stand it.

This is what they sound like:
BAD CATS

Now I want to know what I should do to get rude of that sound.

I know I could just put 4 new cats on there and call it a day, but even though I get OE parts at cost they will still be quite expensive specially since there is 4 of them.

I know some of you will say "dude, that's the heat shields" trust me, it isn't I removed them and it still rattle like no other.

Now a few things to consider before you make suggestions...

1) I have a UUC RSC36 on the car, I wouldn't mind it being a bit louder, but I DEFINITELY do not want my BMW to be obnoxiously loud.

2) I will not put something on there that will give me less power!

3 I do not care about emissions my father OWNS an inspection shop so that is no issue for me.

I was considering some KO track pipes with O2 Sims, but again, not sure how loud it will be with those...

so please, any feedback will be more than appreciated

DEATH2000 · 11-04-2005, 08:32 PM

One word: Track pipe. Ask Harry for more details.

**tomctx** · 11-04-2005, 10:14 PM

Have you tried this place for replacements?

http://members.aol.com/sportscarconvert/index.html

I have heard good things about them and they are advertised in the Roundel.

**94bmw325i** · 11-04-2005, 10:30 PM

Buy a high flow catalytic converter?

**tomctx** · 11-04-2005, 10:54 PM

There are actually 2 cats, 2 resonators, and piping all welded together as a unit. Supersprint makes the mid-pipe without cats, but with resonators, or a mid-pipe without either, I believe. They are good quality stuff, but not sure of price.

**Spieluhr** · 11-05-2005, 02:13 AM

quick and easy: take it to a muffler shop at the end of the day and pay them 50 bucks to put straight pipes in.

Or you could go with OEM quality parts for a track pipe.

**xsperf** · 11-05-2005, 11:40 AM

does it smell like rotten eggs?

**defkon99** · 11-05-2005, 01:03 PM

Quote:

Originally Posted by xsperf

does it smell like rotten eggs?

Hey mine does smell like roten eggs while traveling at high speeds say 70+ MPh WTF ? Xsperf??

oh yea i live in TX and they got no smog here so should i just run strait pipe? to my uuc??

**xsperf** · 11-05-2005, 01:21 PM

that means ur cats are bad, defkon

**defkon99** · 11-05-2005, 02:45 PM

oh no! whats do i doo! can i just cut um out?

**xsperf** · 11-05-2005, 04:11 PM

well yes you can, but you wont get rid of the rotten egg smell, the sulfur

**defkon99** · 11-05-2005, 04:33 PM

so .. get um replaced or what ? how do i get rid of that sulfur?

**xsperf** · 11-05-2005, 07:25 PM

no dude, get it replaced, the cats are supposed to "filter" out that smell

**Rooz** · 11-05-2005, 08:00 PM

Quote:

Originally Posted by Spieluhr

quick and easy: take it to a muffler shop at the end of the day and pay them 50 bucks to put straight pipes in.

Or you could go with OEM quality parts for a track pipe.

True but that's ilegal and not everyone would actually do it

**voca** · 11-05-2005, 08:18 PM

most independent places would do it, they just wont give you a receipt.

just like getting illegal tint.