Part 4 of our multi part performance upgrade dyno test series includes our synthetic box of lube available at www.cyclesolutionsonline.com. After NGK Iridium plugs, K&N air filter and a Jet Scream complete breather were installed  on a 2005 Harley Davidson Duece, we did a box of lube full service oil change featuring synthetic oil and a K&N oil filter. Dramatic results were dyno tested and recorded by Cycle Solutions Inc. Starting at 62 HP the 2005 demo Duece now makes 73.98 well 74 HP without tuning.