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Discussion Starter · #1 ·
My Father-in-law had an '01 Ram, 5.9 that had 2 cats. My '01 has only one. Why two different styles? Apparently his had 4 o2 sensors where as mine has only 2 ( before cat & after) . Anyone know if it's possible to change mine over to 4 so I could run true duel exhaust?
 
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