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yea unfotunetly they are, i had the same problem, gonna have to get downpipe. What i did was i bought a downpipe that has the flange to bolt up to the cat and a cat delete pipe, so that way if i need the cat in the future for emissions i can pop it on with the new downpipe.
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2016 F450 6.7L XLT 4x4Dump, bone stock
1994 F250 7.3L XLT 4x4 ZF5 , Centurion, 4" Lift, 6637, Gulf Coast Bypass Filter, Big fuel tanks, dana 60 swap, No longer dually
1997 F350 7.3L XLT 4x4Dump, E4OD, 4 in exhaust, TS 6 position, 3/8 Trans line+external filter
2013 Scag Turf Tiger 61" 1.1L Caterpillar Diesel
1960 John Deere 440 Backhoe 2-53 detroit