Re: 98 mustang gt 4.6l cat converters
Sounds like you've got an off-road exhaust system. There are many cat-less pipes made for your car. You've got two ways to solve the cat efficiency issue (1) add a set of MIL eliminators or (2) have the car custom tuned and shut the rear O2's off in the tune.
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Jeff Chambers
1990 Mustang GT 10.032 Seconds / 137.5 MPH
14-time Street Warrior World Record Setter
CRT Performance
2001 Tropic Green Mustang GT - 12.181 / 113.2 MPH
2002 Ford F-250 Crew Cab 7.3l Power Stroke - 17.41@77.2
"There's nothing boring about a small block automatic shifting gears at 9400 rpm!"
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