tecno boss/puch maxi

jason /
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I have a stock 77 maxi sport, I've done all the 2 hp upgrades including drilling the stock exhaust and this got me 30-32 mph. I just installed a tecno boss and rejetted and I'm now running 27 mph . WHAT GIVES? Do these pipes suck or am I over looking somthing. I ran a wire into pipe and didnt feel any restrictions. Any body running this setup? Any help would be great!

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