RE: 6 speed exhaust.
Corsa is very good, but very expensive. You can probably save money by ordering it and installing it yourself....it is not difficult. I installed mine (Magnaflow) in about 2 hours by myself. Lightning Performance has the Corsa for $1370 with free shipping (for the 6 speed). That is the cheapest I seen the corsa but other board members may know of a better price.