E39 M5 remove CATs or not? - Bimmerfest - BMW Forums

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E39 M5 (1998-2003)

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Old 11-26-2009, 09:29 AM
M5Pentagon M5Pentagon is offline
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Location: London, UK
Join Date: Nov 2009
Posts: 37
Mein Auto: M5
E39 M5 remove CATs or not?

Ok, so should I remove my CATs or not?

What will it do?

Increase performance?

What should I be aware of apart from the legal aspect?

I think it should make the noise somewhat deeper/throatier, but what do you guys think?

Many thanks in advance.
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Old 12-15-2009, 09:32 PM
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Location: annapolis maryland
Join Date: Dec 2008
Posts: 85
Mein Auto: 2001 540i 6speed
You will have to run simulators on the downstream sensors to trick the engine light, The only legal aspect would be emissions if you have the in your area and because of where the cats are located I doubt any "enforcer" would ever know. You would have to get the car dynoed before and after to see if there would be gains, unless someone already has dyno proof that you will lose or gain power...
Import Sports, Glen burnie MD, 410-553-6910
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