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1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

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Old 01-04-2011, 11:53 PM
loseboltssinkships loseboltssinkships is offline
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1991 f150 catalytic converter cheat

i have a 1991 f150 5.0 302 and im gonna change the exhaust. My old truck was a 1991 f250 with 351 put stacks on that one but when i did it i just ripped out the converter and it starting running crappy. On my new truck i wanted to put the exhaust on it but how do i bypass the catalytic converter?
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Old 01-05-2011, 01:03 AM
xxshine xxshine is offline
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Depending where you live, most muffler places won't do anything til the stock exhaust is past the converter. I think it's a big fine.
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Old 01-05-2011, 01:09 AM
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Hotshot869 Hotshot869 is offline
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Well what you COULD! do, is get a High flow cat and dual exhaust, or whatever suits your preference. that way you still retain the "cat" but you also got the nice sound you've been looking for...just saying..
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Old 01-05-2011, 10:53 AM
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The presence or absence of a converter has no effect on the EFI system in these trucks, however if you remove the whole exhaust system including the y-pipe and converter you must re-install the O2 sensor somewhere close to the original location.
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1990 5.0HO AOD XLT X-Cab F150 3.55LS, 1994 3.0L 5-sp x-cab Ranger 3.45, 2004 3.0L 5-sp X-cab Ranger Edge 4.10, 2004 2.5L 5-spd Subaru Legacy
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