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Backfiring after fitting BOV

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Namibia
#1
My S 280 tuned Fiesta-st has been mapped with a GFB DV + ... Yesterday I removed the DV + and fitted a turbo smart Kompact Dual port .. Car feels so much faster now but also started to backfire abit ...Does the car need to be retuned to accommodate the Dual port now ?
What other Bov can I use on this setup ?
 




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