Chopping stock exhaust? good or bad? Backpressure?

I just recently bought a used 2003 R6 and it came with the stock exhaust chopped down. It sounds decent, not as nice as an aftermarket pipe, but I was riding it for a while on the highway and pulled off the side of the road and pulled the clutch in and it just died. I was shocked and quite angry seeing as how this was my first ride with it!!!! Just wondering what would cause something like that to happen? Is it because there is not enough backpressure from the exhaust or is that a description of the coil recall problem? It also does it when I am just idleing in a stopped position and then I crack on the throttle quickly up to about 8,000 rpm and it will die. This is only sometimes however. I am looking for some advice please help.

I am not sure exactly what it idles at, but when I crack on it, it drops down to idle and then dies. It doesn't stay up there for very long either, like it goes down very fast. It is kind of hard to tell exactly when it actually dies though. But another thing is when I gradually bring it down to a lower rpm just by coasting and without using the clutch, then it will stay running. Very inconsistent with how it is acting. I am not sure also if the previous owner has not ridden it in a while. Only 3,000 miles on the bike though. Thanks for the input.

alright circe, but you better be right. but really what else could it be? 3,000 miles, i have no idea, please help anyone.??? i ran some fuel injector cleaner through it and ill see how that goes otherwise i am out of ideas. anyone who can help with experience please help.

i noticed that it idles lower when it is warmed up. it idles at about 1800 when i first start it up and then after i ride a while it will idle at about 1300 or even lower. what is the right idleing spec for an 03 r6?

oh, well i guess im retarded then. lol