It is pretty fast. The cool thing is, it drives just like a Pro 4! I wonder why? :D

Alright, so here's how I did it. I first had to find some arms that would work on it. So, I ordered B4 arms, but when I got them, they had to be cut down to size then I had to space them correctly. For CVD's I used MIP CVD bones for the B4 and installed them on the Pro4's stock axles...gotta love MIP. Next, I had to make the turnbuckles long enough to reach to the arms. To do this, I just used RPM long shank ball cups. The front shocks and shock tower were just the right size, but I changed the oil to 35wt and put on AE brown front buggy springs. The rear shocks needed to be longer, so I found a pair of Losi BK2 rear shocks on eBay for about 10 bucks, so I got those. With the longer shocks, I would need a larger shock tower. I was looking through my parts box and found a carbon fiber rear shock tower for the RS4. It had to be re-drilled and I spaced a 1/8" aluminum rectangle behind it to make the shocks line up with the back of the arms. When I first got the car, it had 3* camber built into the pivot blocks, but the B4 arms already have 1.5* camber built into them, so I had to get 0* pivot blocks to make it work right.

Next, I had to find a working body on it. I wasn't about to put a fugly XXX-4, so my choice was between the Kyosho Lazer ZX5 and the JConcepts BJ4. Naturally, I went with the BJ4 body and underbody to protect the precious carbon fiber. Now I had to come up with a way to mount it. I used the supplied screws for the underbody and use velcro to mount the main body to the underbody (just like I do on my B4). To mount the wing I "modified" a pair of B4 wing mounts with my trusty Dremel. Now, I didn't want the bare carbon fiber just sticking out in the front to be a bumber, so I got a RPM mini bumper for the B4 and flattend the bumps on it and re-drilled holes to make it fit.

Finally, with everything almost set to go, I needed to figure out what wheels and tires I was going to use. The wheels are discontinued Hot Bodies made for the Super RS4. I left the rear ones alone, but I had to narrow the front ones to accommodate the narrower front tires of a buggy. For tires, I went with Losi taper pins in the front and Lose BK bar's in the rear, which, as I've been told, is the ideal setup for Hot Rod's track.