New to NITRO! What do you recommend for the new 2.5 t maxx to upgrade the exhaust muffler and the cyl. head. Heard good things about Ritter for the exhaust???? .....not much on the Cyl Head??? Alot to look at all the different sites. Naturally traxxas says no mods needed. I tend to believe that all you nitro runners have experienced differently. Would appreciate any info.