I was searching ebay and found a dual exhaust setup for the Ofna buggies. I think it will look pretty cool coming out the back of the car. BUT, I'm not sure how the motor will react with no muffler. I used to race motocross (2 stroke), and the bike had no power if you ran it without the muffler.
Here is a link to the sale.
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=3156373373&category=34063
Here is a link to the sale.
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=3156373373&category=34063