Any thing you want basically.
I just called them and discussed what I wanted, which was specs for a good mid throttle torque, a little sound to it at idle, decent gas mileage and could use the factory magnum rockers.
I posted a video a few days ago, but that was a cold start and a bit lean on the choke so I don't think it's a fair representation of the normal idle.
Lets say it sounds not quite stock but I do get lots of compliments on the sound of it.
We ended up with 214/224 with .512 lift on a 110 LSA.
It's definitely noticeable at idle but smooth's right out off idle.