BadTriumph
.020 Over
If you do the 12 minute tune after installing, you should be OK. I put mine on the dyno after installing the filters and the fuel to air mixtures were real close to where they needed to be. We tweaked a little and found a couple more horses. Just my opinion, but if you are looking for performance, why not go the extra mile and get a tuneboy or power commander so you can fine tune as you add other goodies down the road?