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Message: <blockquote data-quote="ALBundy" data-source="post: 302569" data-attributes="member: 15">For our Malaysian market, the catalytic converter can be removed irrespective of whether its OBD1 or OBD2. Not the same for the States as the software on the DME is different due to the strict emission control regulations over there.  I had my catalytic converter removed on my OBD2 without any EML light appearing. However, I restored the cat after a couple of days. Removing the cat may make the car feel lighter, but not necessarily faster. The engine will gain HP in exchange of torque. For cars with automatic transmission, removing the cat is not a good idea. In most BMWs, the intake and exhaust system are very well sorted out for an optimum balance of performance and fuel consumption efficiency. For cars with manual transmission, a sport cat will be optimum <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile    :)" loading="lazy" data-shortname=":)" /> Cheers</blockquote>