Originally Posted by tboe

Defeating emissions equipment is against federal law therefore not allowed to be discussed on this forum. This includes any federally mandated equipment such as DPF's (Diesel Particulate Filters), CAT's (Catalytic Converters) or anything of a related nature.

Edit: This applies to U.S. laws and those under it's jurisdiction. These laws do not apply to Canadian and Mexican regions.

Originally Posted by epa2006

Non-original electronic chips or computers, whether
fitted as a direct replacement or in a ‘piggy-back’
configuration, are not permitted to be used in an
engine management system unless it can be
demonstrated that their installation and use allows
the vehicle to meet the appropriate ADR. They must
also be sealed or otherwise constructed so as not to
be reprogrammable.