I know it can be done with 12mm, 6BOOST/FPT have done a few cars with 1000whp.. Typoon_freak made 1080whp 39psi with 12mm studs, but his torque curve was pretty soft.. I am happy with 800whp, just want the bloody head to stay on! However, we might have to soften the tune a little, last run we did torque hit 1200nm 3000rpm when the head lifted... Sorry for hijacking your thread John, the last thing you want to read about is head lifting issues especially when you've got a brand new motor... John, pics like you promised......