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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.
That pretty much leaves your with shorty headers and cat-back system as your only option if you want to stay legal.
To me, the way the current EPA Emissions law is written is a crock. If they want to regulate emissions numbers, that's fine, they can do that till their blue in the face. But trying to regulate what parts and how I install them is absolute BS as long as i meet all emissions numbers.
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