hi can i race a ttr- s2 my mate said i can buy his 1 are they any good, l;ike can you upgrade them like the pro model also the s3 is out now should i get the s2 or wait save my money up and go for a diff car such as rex x or a hobao hyper, as any one on here got an hyper 7 with no radio gear for sale or any 1/8 buggy with or without radio gear thanks