Tail Pipe help.

Mytail pipe is about 1-1/4" too long with the engine all the way against the intake ducts and 20mm gap between the exhaust cone and the front lip of the pipe - Without the bell mouth.
I can move the engine a little further forward, about 1/2 ", if I cut down the intake ducts, but that won't give me the distance I need to use the pipe as is.
Anyone else had this issue?
And how in the world would one cut the pipe to shorten it?
Any help much appreciated.

Regards, Jim