J333EVO said:TBH I have only ever heard of s/s manifolds cracking on turbo applications like the integrale as the turbo hangs on the manifold so all the weight is taking by the manifold which is not great when expanding and contracting with the massive heat generated with turbo cars, to overcome this some manifolds have slotted holes rather than just round holds to allow the manifold to expand and contact and not be restricted at the bolts which is where the stress cracks normally appear. If cracking is a concern then treat the car a little better, let it idle for 30 secs or so before switch off to allow the manifold to cool a little slower, especillay if its been on a long or fast run should help prevent it from cooling to quick and cracking.
Manifold design and manufacture had improved over the years and with time niggles that were missed in development are "ironed" out
Actually Aaron the can crack, but this is only when people use knackered engine mounts and either don't have a flexi pipe, a knuckle joint or tighten the springloadecscrews on the knuckle joint to much.
But I agrre it happens less than ever before due to advances in more recent stainless steel development.