TZM 150CC/2 stroke - plane of hardcore modification

[TB-Racing]

....wrapping the hole exhaust pipe with silicone sheets and truck inner tube..

I am playing around with small displacement engines for a very long time (4-stroke) but your idea sounds like a strange modification, why would you use rubber / silicon sheets, heat resistant exhaust wrap (tape) works much better.
just as reference: http://www.firesleeveandtape.com/aut...rotection.html