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running with o2 sensor removed

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i have an 2001 dodge ram 1500 with a 5.2L i bought the truck and some one had removed the catalytic convertor and the down stream o2 sensor the truck sounds good but does running with the o2 sensor out cause the truck to lose power? the truck runs fine just wondering if i replaced the cat and weld in an o2 bung if it would have a little more pep?
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the down stream just keeps tabs on the cat.................the Front one it the one thats important.

Best bet it to put a new cat and BOTH NEW O2's installed
 
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