Installed a little exhaust goodie today... Ordered a remote controller and fuse tap from Amazon... total 25 bucks. Came w/ two remotes but I also programed the on/off into 2 of the Homelink buttons.
At first I didn't think it was working, but that was because I was at idle and the flap is always open anyway so it doesn't change anything. Where you really notice it is during moderate accelleration or higher RPMs on the road. Not really a huge difference like cutouts, but still a little extra sound to what already sounds good...
Edit: No need for this anymore with Corsa Catback.
