Haven't posted in quite some time now. I finished rebuilding the car after having it sit almost completed on my desk for about a month or so. Here are some pics.
It's belt so maybe an rs4 2?! I looked up the dimensions and I'm pretty damn sure its a rs4 2, so it's a 1/10th scale. I thought it might be the super nitro but it's to small. You're also going to need a pipe for that as well.
I had trouble identifying my Hpi rs4 as well. Send pics to Hpi and they will tell u exactly what you have. There pretty good rc company compared. Parts are on amazon and ebay. Aluminum and carbon after market upgrades.