Losi 5ive 5-t 定 hpi baga5sc

HPI is not a very durable car.....  Losi la.  

http://www.davesmotors.com/Products/

DDM have lot of parts for both.  Donot buy China copy.  The car will fall apart as soon as you hit something.....  Top speed sure HPI will be good with 29cc engine, but for losi you can buy a roller and add engine.  Mine have ESP 30.5 now.  Sure a lot better then the stock 29cc CY come with RTR kit now.  

BTW:  One of the best mod to make the engine faster:

http://www.davesmotors.com/DarkS ... RC-CY-Engines-.html

RPM pickup much faster!