the ulmer kit is a midmount style with a cast header.. trail tank, etc etc etc. all kinds of options for a really good deal. you would need to call them and talk to them about there higer boost level kits. talk to mtdream on here, he has been running one for 2 seasons now I think.
honestly, I think for most of us, the newer pump gas kits can put us a lot farther up the hill faster then we want to get there, the need for race gas to go really fast is being phased out. so just some food for thought. the impulse kit at 17# is just dumb.. thats so freakin fast.. i run 12 on a halfway good setup and its pretty scary fun.. and i have run it at 14 and its even more fun!
alpine makes a low boost rear mount, then normal pump/race combo setups for a "front" mount.. heres there website. pretty much team canada for turbos
apline turbos