I was disappointed with the J-Tec that I got when I purchased the engine because it looks a little "cobbed together." The welds aren't "pretty" and the part of the muffler that bolts onto the engine is so huge I had to cut away part of the cowl for it. It kinda looks like it was made from leftover parts found in a high-school metals shop. To be fair, I'm sure the J-Tec performs well and there are many people who are just fine with it, but the Slimline looks like a much better-made piece and is more compact. (I know the muffler is hidden (mostly!) inside the cowl, but I'm one of those guys who can't sleep at night knowing any part of the model is "ugly." ) And inside the smaller confines of the Extra cowl the smaller Slimline just fits better. Finally, I'm not worried about extracting every last bit of power from the engine because it's flying about a 14.5 - 15 lb plane (at least it was 14.5 lbs with the Fuji).

Pics tonight I promise - I made a real sweet extended carb arm out of carbon fiber and have a pretty sweet choke setup too. I can also show the cowl cutout in-case anybody else is mounting one of these engines on the 27% GP Extra (330S ARF).