GT Griller

iTrader: (8)

Ive been consistently running slower NA since last season....only things changed are my converter and my plugs....I swapped to TR6's for the bottle from the tr 55's i had.....now im trying to narrow down all the possibilities...Ive also been running a different track. They are very close only about 100 miles between them so i dont think the elevation change is a the big difference....COuld the plug swap be a part of why i am a full 3 tenths and 3 mph slower?...I know there are alot of factors but thing is i cant race at the old track since its shut down so im left to wonder.