Actually that information is off. Its understandable though cause its a different setup than the other STS motors. If you want the true specs of this motor I can give it to you , its the latest arrival from STS. I also have a few of these in stock as well already have a bud running one and the STS pipe , it sounded amazing. I call it the "sport" motor, cause its a tad better than the E series.
Its a different fit in the STS line but if your looking to save 30 bucks over the d3r its worthwhile , especially if you dont race state races with it. Ill let you know why , because this motor is essentially illegal. Its also a bit advanced over the d3r , but at the same time its lacking in another area. Reason why I say its wild fit. Took me about a month to figure out the difference between it and the D3R.
http://www.pro-hobby.net/shop/images..._prohobby1.jpg
http://www.pro-hobby.net/shop/sts.html - You can find the actual details on the motor specs at that page.
Let me know if your interested, I also have the option part to make this motor legal. PM me and I can give you the full scoop. Its kinda a long explanation.