Serving Our Country!
Join Date: Apr 2010
Location: Clinton, MS
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If you EVER intend to sell your truck and you have deleted your catalytic converter from the truck's exhaust you will be committing a federal-level fraud in passing the truck off as street legal.
At the very least be forewarned of the potential consequence of this off-road emissions modification and keep the catalytic converter capable of being reinstalled with a delete pipe.
You will pollute more with the deletion of catalytic converter and you will relieve a bit of back pressure - both are true statements. There is no reason for the presence or lack of presence of the catalytic converter to affect fuel economy unless you have a "poisoned" catalytic converter - which would require replacement to provide the reduction of oxides of nitrogen and other pollutants...if it were obstructing exhaust flow then there is likely something wrong earlier in the combustion process like excess fuelling or incomplete combustion (perhaps an indicator of piston ring wear...lack of compression anyway).
P.S. I have a 4" turbo back stainless exhaust with an aftermarket - smaller than stock - catalytic converter from Magnaflow...probably not definitively street legal but I can put a stock catalytic converter back on the truck - I'm never selling my truck anyway. The original owner hollowed out the stock catalytic converter but as it has a 3" restriction I did opt for a full 4" passage...my wife is very sensitive to the exhaust so a catalytic converter of some sort is definitely a must. Just providing full disclosure with my earlier observation.
Jonathan D. Howell
Lieutenant Colonel, U.S. Army
2005 EarthRoamer XV-LT (Ford F550)
"Americans Travelling America"
Last edited by howell_jd; 05-28-2011 at 12:17 PM.
Reason: Full disclosure