Yeah I would get the full kit. Just because some people might not like how loud your bike is when riding I would put a silencer on it but up too you.
The real JetPro exhausts arent loud at all and if you know how to build dual chamber rev pipes it quiets a two stroke down to almost whisper quiet but doesnt diminish performance...it enhances it..
2011 Cag.Won it in a race against my 41mph X1,,,Thing was awefully slow and couldnt break 25mph with the EPA restrictors in the carb and exhaust
43cc 40mm bore engine,,Stock head thats ported with widened transfer ports,,widened/raised exhaust port and blueprinted to bottomend,,lightened the stock piston,,,stock crank,,lightened stock flywheel,,lightened aluminum clutch,Aluminum pullstarter housing,homemade dual chamber revpipe,,modified walbro wt603 carb,,stock reeds,,modded aluminum intake,modded v-stack w/choke,UNI airfilter,,E3 Sparkplug,HP wire mod,no basegasket,,HP 7tth Clutch housing w/3rd bearing support
37mph on bone stock gearing 7/68...........
If you look at the 43cc 40mm bore cylinders theres no compression relief notch like the larger 49cc 44mm cylinders......Those notches bleed off alot of power
The ADA 2pc 40mm 15:1 kit is a way better choice if you modify them to perform....Same goes for all 44mm 2pc headkits....They need enhancement to be really effective too but the 40mm bore doesnt have the decompressor notch