Blowing exhaust

[stevomtb1]

I have been running my recently resto'd PK50XL for two weeks now and have been disapointed with the speed. A mate is going to match the ports for me next week but I have also noticed that the Polini exhaust i fitted is blowing.
The exhaust came in 2 bits: the first bit bolted to the engine and the second piece(the silencer bit) pushed into the first bit. But this is where it is blowing from. Should I have wrapped some exh bandage around it first or am I missing something?

[Juan]

Where's the marks from blowing?Presuming it has an exhaust gasket fitted you should be fine at the barrel.The slip joint is prone to blowing when cold but it should expand when warmed up and seal it up.