Get an RB engine u wont be dissapointed!!!! i had a standard X12 3 port and it rocks, fast, easy to tune.... now i have an X12T 5 port and this thing is awesome already... its had about 6 tanks and i can feel its going to be a strong engine ive seen these engines go at my track and they have some serious power, i havent had a chance to give mine a proper run cause its still in the run in process