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I have a 2008 1100 midnight custom with about 5k miles on it. I'm planning on doing some engine upgrades. I have already done the AIS delete. I've been thinking about doing cams have been looking at the PCS Triple X2. Get a Maxair engineering predator pro kit and a dyna ignition. Do I need to upgrade my clutch if I do these modifications and will all of this effect fuel mileage much?
 

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Throw some POD filters on and proper jets, then see if you still 'need' more.

All the mods will have little impact on fuel efficiency ..... But your constant twisting of the right hand as a result of the mods will kill your mileage numbers :D

I was getting low-mid 40s mpg before mods (but only a handful of tanks before mods so not a great historical average to compare). After mods it dropped significantly (low 30s mpg) for several tanks but now with a long history of refills to average out (and less 0-100 runs :) I'm consistently around 38 mpg.


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