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3rd Gen Ram Tech2002-2008 Rams: This section is for TECHNICAL discussions only, that involve the 2002 through 2008 Rams Rams. For any non-tech discussions, please direct your attention to the "General discussion/NON-tech" sub sections.
That is a horrible idea for a gas engine. If anything, buy your 3 to 4 adapter and weld it on after your current muffler and run pipe the rest of the way down to a 5" tip. That way you won't take power away