Terryscustom
640cc Uber Pimp
The Jtec is roughly the same dimensions as the stock muffler and an oz or two lighter. It's $99 on their site right now, I bought the standard size.
The 30cc size tends toward being a little underpowered with gas so having that extra 650+ rpm and swinging a bigger prop will making learning 3d way easier.
I'm not the first to mention this, but look for upright harrier in videos you watch. They'll all do knife edge spins and blenders etc...not all of them are stable in upright harrier and that's a fundamental maneuver for learning 3d.
LOTS of guy's run a DA50 in that plane....perfect combo. Skip the 30cc stuff, buy a 50 and partake in some of the newer 79" planes and have more bang for the same buck.