[V8] catalytic converter removal?

[sdewitt at stx.rr.com]

Back in my dealership days, we had a customer with a pristine E30 M3. He had the bright idea that removing the cat would make more power, and he had actually lost about 6 horspower when doing so, as well as making the vehicle non-registerable. 

----- Original Message ----- 
From: dsaad at icehouse.net 
Date: Friday, September 1, 2006 10:25 am 
Subject: Re: [V8] catalytic converter removal? 
To: Peter Littlewood <littlepete_19 at hotmail.com> 
Cc: v8 at audifans.com 

> I ended up removing the cat from my '83 Ranger - not because I 
> wanted to, but 
> because overzealous state inspectors running "sting" operations on 
> muffler shops 
> taught them they could not install a used cat on a car - even if - 
> as in my case 
> - I had bought it only a few weeks prior and still had the 
> receipt. Not to get 
> too far into that story, but now I don't have a cat and the 
> exhaust stinks. 
> I like to breath clean air, and the cats help in this regard. I 
> seriously doubt 
> that in a non-racing situation you will be able to tell the 
> difference so why 
> not just leave them on? Even if you pick up 4HP, is it worth the extra 
> pollution? 
> The 3.6L V8 is designed to not need a air pump or EGR valve so you 
> can bet the 
> emission system relies on a specific back pressure range and the 
> cats are part 
> of the design. 
> 
> My $000.020 
> 
> Dave 
> 
> 
> 
> Quoting Peter Littlewood <littlepete_19 at hotmail.com>: 
> 
> > 
> > 
> > hello everybody 
> > 
> > Does anyone have any thoughts about the removal of the Cats on a 
> V8? my 
> > whole system is off at the moment due to a gearbox rebuild. I'm 
> thinking,> while its off to remove the Cats (legal in the UK on 
> cars made before 1992) 
> > My buddies car has had his removed and its made the car sound 
> how every V8 
> > car should do.. On some cars this is beneficial.. on some it is 
> not with 
> > regards to performance. 
> > 
> > any response welcome 
> > 
> > as usual 
> > 
> > Pete Littlewood 
> > 
> > 3.6 V8 1991 uk spec 
> > 
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