Re: Someone on XF has a 'particularly strong' C32/SRT-6 Motor. [Dyno - SI Stage I]
Thread high jacked baby.
I think you should be able to run with the top down if you get a real racing seat in there, like derek has. Mount it a little lower and i'm sure it is much thinner than your cushy srt seat. Just an idea, seems to me like you would lose a lot of straight line speed with the top down.