[Pushit2.0]

That depends on the aluminum alloy and welding method used. I just inside outside weld the hole manifold to avoid any issues. Aluminum is tricky to weld, any pits or sharp corners are the places cracks will start to form. Welding both sides of the pieces ensures proper penetration. If welded properly the weld should be stronger then the base metal. Also using enough heat (amps) and welding rod are important. I will warranty the manifolds I produce to hold as much boost as you can put in there with a turbo, even if Brent Rau wants one, he can runs in 85 Psi without a worry of cracks.
Back on topic how is the page update going?

~John