I guess using overlapping sleeves on the joints and welding those, you can keep the inside nice and smooth. If you use butt welds, I don't care how good you are, you either get inadequate penetration or weld beads hanging in the wind...

I still can't imagine building my setup with preset curves. It would sure take alot of prefab pieces...

Marco Tatta
98.5 SE MTX, Duratec
EGR block, fog light
fix, custom shift boot, monsterflow intake, Ecotek valve
Quasi dual cardoctor exhaust.
Hacksaw short shift, Momo race "s" carbon knob, ghetto rear strut bar, 16 inch cougar wheels with 225/50/16 kumho 712s