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Calling all 550 experts

2373 Views 11 Replies 5 Participants Last post by  Bart
Hi there,

It has come to my attention that North American 550 models year bulit post 2000 have precats in the exhaust manifolds which reduce performance quite substantially. This was not a problem for European models, who are not faced with the stricter N.A. emissions guidlines.

I have heard quotes of as high as 0.5 secs difference for 0-60 times between 1997-1999 and 2000-2001.This is an outrageous situation!

My question is...what can be done about it?

Are there after market,new exhaust manifolds.

Can one purchase and install European exhaust manifolds without reprecussions ?

Looking forward to hearing from anyone in the "know"


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In the USA it is a violation of federal law to tamper with any emissions device installed on a car, regardless of year. I've had this discussion many times among my Jeep buddies. Removing cats (or pre-cats) is a big no-no. You will not find any reputable shop to do the work for you. You could do it yourself, but you would still be in violation of federal law and if you sold the car the new owner could come back at you and force you to put the exhaust back to stock or face federal fines. This is all covered under the EPA's Clean Air Act.

It reads that it is prohibited:
"for any person to manufacture or sell, or offer to
sell, or install, any part or component intended for use
with, or as part of, any motor vehicle or motor vehicle
engine, where a principal effect of the part or component is
to bypass, defeat, or render inoperative any device or
element of design installed on or in a motor vehicle or
motor vehicle engine in compliance with regulations under
this title, and where the person knows or should know that
such part or component is being offered for sale or
installed for such use or put to such use"

The fines are not worth the performance gains............if you get caught.

Not sure about Canada.
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goldyF355 said:
Seems the Canadian Govt. wants to be seen as being the most anal govt in all North America,lol.
Well, I didn't want to say it but since you did.......................
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