Plus if you look at any other exhaust, like say for a Supra TT, quality exhausts that allow for more power to the vehicle cost around $1000 so $1700 for a new exhaust for a new car isn't the worst of starting prices. Just not really the best bargain. You could always wait for other ones or this price to go down.
I see no problem with the price for the Xede controller. That in my opinion is more important than the exhaust anyways. I'm gonna shell out the $1300 for that in a heartbeat.