well done on reaching the point of driving your car
may i ask if your exhaust can is a bike can that came originally with your engine?
if so here,s what we did when racing bikes ( some tracks are noise sensitive ), open up the can & put more exhaust padding ( not wire wool ) around the existing padding, if you remove the old stuff you will be even louder as the wool takes a while to "soot up", rebuild the can & hopefully it,ll help. ( the wool is approx £15 per roll ).
cheers
andy