cut the piping off...put the cat where it needs to be.....just hit the trigger for a sec in a spot so that it hold the cat in place...do it to both ends.....then unbolt the exhaust and keep the trigger mechinizm at about 35-45degree angle hit the trigger and move along without staying at one place to long...do 1cm at a time to get use to it...... try finding some metal exhuast pipes and practice weld on the them and welding 2 pipes together


you want to set the amps so it doesnt melt through the metals