Heres what you do.:
1. Biturbo Pipe
2. 70cc airsal kit
3. foam uni pod filter
4. 68 main jet
5. 22 tooth rear sprocket
6. 26 tooth front sprocket
will easily do 50mph once properly broken in,.
thats my setup on my 2008 streetmate.
runs amazing.
be sure you know how to do the work correctly