thks for the info. grizz1,i should do more testing ur right,it depends on my driving style,& da track that im racing,i lov my 3r so far ,but its just that im (still)lacking bottom currently have the RC8T,& my friend suggest me to use 13th cb for more bottom,instead of 14th ,the track im racing i would say medium track reason cause we got the 140ft straight way,i really dont want to suffer yhe topend