Hello. I have a Tmaxx with a 2.5 and I'll be upgrading soon. I don't want to go over $200 on the engine. Any opinions on the O.S. 18 TZ or Novarossi 2.5 vs. the Traxxas 3.3? Amain sells all 3 but there aren't any specs for the Traxxas. Other engines I should look at? Thanks everyone!