The alfa romeos a 4c as well and is getting pretty good reviews.
There are a few good supercharger kits for the brz now too.
Thanks for the Kei pic and you have a nice DD. I know a few guys who autocross and track their's a lot.
@Thrift Vader: Good luck in the tuning business! It's great that you're in a hot spot for it. I've always found I learn best when I'm among the best, so I wish you well.
I also hope you don't get those clients who think a parts upgrade alone can make up for the most important part in the car to improve - the nut behind the wheel. lol! It's true though. I've seen so many people who think tossing on this exhaust or that intake will make them drive faster on a course with turns. If you come across clients like these, gently advise them to get some driving instruction/coaching so they can take advantage of the extra power.
An extreme example: I was at an autocross and was co-driving my brother's car. I heard a couple guys talking about how they would drive faster if they had this or that done to their car. I couldn't resist, so I asked the organizer if I could drive my 6000lb, 3/4 ton, 4x4 pickup truck. He let me, and I actually beat a few cars. That should never have happened if they knew how to drive. lol!