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Greetings from So Cal. I have a Ness Victory 2008 Jackpot. Tried up upload an image - let's see if it worked. Anyway, I wanted to put shorter and curved pipes on it from Hacker (the Rippers). They are the "quiet option" and have baffles at the back end. This required of course another EFI controller. The first one could not eliminate excessive backfiring. The second one I am trying from Lloyds is a bit better on the backfiring, but not acceptable. This only occurs a low throttle, starting off or slowing down. Never pops or backfires on moderate or fulll throttle. Also purchased a timing adjustment from Lloyds. No help. Stock air box, low resistance air filter.
I have been all over the forum for help, but it seems quite specific. Any advice will be appreciated. Next step will be dyno tuning, if possible. Thanks in advance, Kevin
 

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Welcome , and nice bike !cheers
 

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Welcome brother, gorgeous Jackpot!
 
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