I'm still here, somewhere. I mostly lurk, tired of some of the problems I encounter here when I post. I just read the tweak chamber thread funny stuff. Some people know it all. But, I digress. Nice work on the tweak chamber. Your going to love the sound!! I forgot to call you, we were at Barona the other day running our turbo car (brand X). That was my first time there what a cool track brings back memories of Carlsbad! Alright I like your idea of the aluminum tank below grade. I made my own and I thought I was beating the system but it took me many hours to build mine. Its 23 gallons and has provision for stock filler neck along with 2 outlets and 2 returns. You may be way ahead if you just bought one. TWEAK ON!!