Summit exhaust systems, are they decent?

i just got my summit 2 1/2 kit in the mail today. had the car up on the lift and checking it out for tomorrow when i start it. it seems to me the first long peice on each side dont have the right angle for the rest of the tube to come flat under the car. Is this becuase i have headers on the car, and or also cause its a big block? I might just end up using the back 3/4 of the exhaust and leave mine how it is off of the headers