Hey Colin,
When I was getting quotes on the 3 systems (Borla, Corsa and Magnaflow) I contacted a company here called Mopac Auto Supply. They were the main distributor for all 3 manufacturers here in Western Canada. The 3 were priced as follows: Magnaflow - $1000, Corsa - $1300 and Borla - $1500
I took these numbers to my parts department at my dealership. They couldn't touch the pricing on the Borla and Corsa because we typically don't order those, but they could offer me $820 on the Magnaflow plus no shipping charge because I just included it on the stock order.
After all the money that I've spent lately, I decided to go with the least expensive one of the 3.
I'm very familiar with the Magnaflow exhausts on vehicles that we mod here at the dealership and I have always been pleased with the sound and their lifetime warranty.
Hopefully I made the right choice but we'll have to see after install