I bought my installation kits from cjtmini (Chris Thompson). He has a sticky in the "doodlebug" forum ($125 each when I bought mine last March-aprill 2010). Just send Chris a personal message and he'll give you the details (he likes payment through paypal).
After you install the clone engines, your DB30s will have a top speed around 30-33 mph. You'll need to get a jackshaft upgrade kit from ProMod ($125) so your Warrior can kinda stay with the cloned DB30s (The warrior speed will be around 24-25 mph.
Sorry I was late replying!
Jimmy S.