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Discussion Starter · #1 ·
Our KRX 1000 added a mbrp muffle and new muffler gasket and and did reflash,and we are still have backfire when deceleration. Does anyone know what the problem could be????
 

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Who did your tune ? I drilled out my cat and a tune I’m also having backfire issues. Mine also appears to be running lean looking at the inside of the tail pipe.
 

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Discussion Starter · #5 ·
We didn't find a fix...we ended up putting the stock muffler back on,although we have been checking with friends and shops to see if anyone has found a fix,thus far nothing.
 

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I asked the Dyno jet guys about this back fire condition that many complain about after re tuning there ecu.. has to do with the ecu in a closed loop at lower rpm and didn't indicate much could be done about it.. I went with the HMF and dynojet and have no back fire issues..
 
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