Quote:
Originally Posted by wbingham
The very same EPA law making cat removal illegal also make "high-flo" cats illegal as well.
The EPA code prohibits replacing or even moving any part of the the factory emmisions control system. By the letter of this law simply adding long tube headers would modify the location the of the factory emmisions parts and therefore be illegal.
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I don't think that is correct. The law does not bar replacement of parts with aftermarket products. It goes to intent; is the product you are replacing intended to defeat the emission process. If it flows better but is still effective, then I think it could be said that the item is legal.
From section 203(a)3B it is illegal:
"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 subchapter, 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;"