ORIGINAL: Deandome

c) Savage DID incorporate LOTS of T-Maxx features. Sure it's a different chassis, but the entire truck was a RESPONSE to the Maxx & HPI has evolved it to keep up w/ Traxxas re. speed, 2-speed, reverse, powered starting and wheel & body compatibility. The S-21 was lots SLOWER than the Maxx 2.5, so they gave it a .25 engine. People liked EZ Start (or at least it helped them choose Traxxas, even if they ended up not liking it), so BAM, the S-25 has Rotostart. HPI made a unique truck but they saw what worked for the HUGE selling Maxx & adjusted their feature set accordingly.