Hi Jamie a race air filter is not going to give you much more top end speed, maybe 2 or 3 mph extra & bit more acceleration. As for the rollers, the lighter you go the quicker off the mark you'll be but will probably sacrifice top end speed. you can dick around with the roller weights forever till you're happy with the performance.
You can download the manual for the DNA free from www.carlsalter.com & follow the links. Here's another interesting website www.tunemyscooter.com or if you just Google Gilera DNA 125, there's lots of pages on tuning, parts, discussions etc......
steo
June 2009
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