Billet aluminum tappet breather cap kit P/N DPM-50-2200 - $26.99
Comes with cap, hose, clamp and zip ties to hold everything in place. Easy to install, this item relieves excess pressure in the head to save oil seals and allows the motor to rev up quicker. Your choice of color: silver, gold, red or black.
Thats from DPM and you also get 10% off for being resgistered to planet minis.
As far as the oil cooler goes, you don't need one until you go above 88cc, or you get 88cc with a head. It becomes more of a 'need' when you get a head.