I'd honestly take it back. That could have easily been done with a curved pipe. You NEVER want a hard 90 wall in an exhaust. That looks like it was done at a Meineke or worse. Especially the cheap aluminized piping they used with the crimps in it instead of mandrel bends. That pipe will be rust in no time.
Thanks for your opinion, but there isn't anywhere to take it back to, I did the work myself, the reason for the 90 degree elbow & not a 90 degree pipe bend is I only had limited space for the pipe to clear the right front tire, and the pipe isn't aluminized piping it's new tail pipe from a local muffler shop, and there aren't any crimps in the pipe is was cut & welded into the 90....