I don't offer a warranty because I see a ton of people driving around with their entire downpipe weight+ turbo + wastegate on the manifold. Not many manifolds can handle that and even cast ones crack. You have to brace the downpipe behind the block, then it will run for years with no problems.
For the $250 shipped price I sell them at, you can't include a warranty, only guidance on how to make it last through proper installation.
Of course, you could pay 5 times that amount for one with a lifetime warranty, or 3 times, or etc. Your going to get what you pay for in SOME cases.
We run them, they are on a BUNCH of cars, no cracking because its braced, they make alot of power.
hard to beat for $250 bucks. But you have alot of choices out there. If you want to pay 3x more for one that will make the same power but be less likely to crack, you can do it. I sell stronger ones too, but they are like $400.
I will tell you straight up.. These are not the best manifolds with money being no object. These are the best VALUE out there hands down. they make the power of the high dollar manifolds for as little as 1/5 the price. thats the honest assesment.
Jeff