3" Exhaust Dented/ pinched will effect preformance? VY ss

hey all, not sure if this is rite section to be posting this.
how ever my Vy ss wags has been hit with bad luck, i was driving along and a truck in front dropped a block of concrete on to the road, i was not able to saftely dodge this obstacle at 70km/ph , so basic question will this effect performance on a stock ls1, but im camming it after Christmas (hence 3" pipe) and would like to know if the dent will compromise performance / back pressure etc..

ive done some research and there's a pipe expanding kit on the interweb for as little as 30 dorra,
or should i goto a exhaust shop and get them to cut and re weld,
or to leave it and stop being a pedantic about my car haha

my thought about it, i am an electrican by trade, and ive learnt that electricty can only flow as well as the smallest cable in the line. is the same case for airflow on a exhaust. it seems logical

pics of the damage throw us some feed back,



has anyone had experince with this?

 

yea that exhaust is only 2 weeks old spewin,

im thinking of buying that tool and taking her apart.. the applying heat and working it out with that expander tool ,, once done abit of gal paint and i HOPE she 'll be good enough

 

Yea Ill just give the expander ago, if fails ill get the guys who are doing my camm to plah with it thabks for feeback people

 

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yea ive had a better look at it theres a bend before the dent on ones side. and a welded muffler on the other.. so expanders a miss.

i think it slower of the mark. but i could just be thinking things.. however my back fires are alot different. but yea i wont worry about it until i get my cams in.