I'm sure its been discussed but i searched and didn't see a real answer so I'm going to go ahead and make a post. I was wanting to know if anyone has built a 5AT G to 500-550+whp? I'm a couple months away from being able to start doing engine mods and I'd like to go with a greddy kit and get roughly 550whp but I need to know if the tranny can handle it, or if there has been an aftermarket auto tranny to hit the market yet?