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03-25-2007, 07:43 AM
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Moderator
Join Date: Aug 2000
Location: Milan, OH
Posts: 2,699
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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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