You will soon find out that the Stunt Racer needs the wheelie bar that has been fitted at the rear of the chassis.

The battery box is slung under the chassis, so the B-Model has a very low centre of gravity: there are no wheelies with this model. This LEGO® Technic™ set is designed to provide an immersive and rewarding building experience, and features realistic movement and mechanisms, helping young builders enhance their motor skills, hand-eye coordination and imagination. I think the Technic designers have continued on a winning Technic concept with this latest Remote-Controlled Stunt Racer.The rear of the box tries to demonstrate how the Stunt Racer can pull wheelies. It also shows the B-Model. The first thing you will notice about the Stunt Racer is that, due to its near instantaneous acceleration, the racer will perform wheelies every time you race it. With its 2 electric motors, receiver and remote control, this LEGO model provides great driving moments, while being a construction set. Its 2 large plastic chains transport it easily over various obstacles. Another plus point is the 2-in-1 system: if you wish, you can assemble all 324 parts to form a sportier off-road vehicle with a rear spoiler. The main model measures 17 x 22 x 15 cm, the alternative measures 12 x 20 x 19 cm. The manufacturer does not supply batteries. Before you take off into the sunset though, you'll need 6 AA and 3 AAA batteries. Customise Your Car

All the weight is centred above the rear axle and having the battery box raised means the racer has a relatively high centre of gravity. The model has lots of playability, Power Functions have been included, and the set is very reasonably priced. I am sure that this set will appeal to a wide range of fans.Overall, it seems a very favourable comparison: the two sets are similarly priced even though the L-Motor is twice the price of an M-Motor.