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Hey guys engine light came on saying bank 1 and bank 2 were running lean. I just recently got pypes true dual exhaust, would that cause it? My idle isnt as smooth as it was. Also abs and tcs are not working. Code reader said rr failed then on next one it said rr missing. But I just got it replaced.
 

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Same happened to me, but not until after i installed the no tune cai. Duals were the first thing i did and had no problems
 

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I would recommend getting the tuner. Some of the "no tune required" cai's actually do require a tune even though they are less restrictive then the cai that do require a tune.
 
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