If you're worried about voiding the warranty, take it to the dealer.
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I have a 3.8 08 rubicon and The exhaust have manifold has cracked several times. is there a permanent cure for this that won't void Chrysler's lifetime power train warranty?
It may even be covered under warranty.
I just replaced passenger side and I'm now working on the driverside. I'm trying an experiment with VHT high temp ceramic paint which I hope it will provide a protective coating so there's less stress on the metal. It was only $10 for a can so it's a cheap experiment.
So far the passenger side has been fine, but it really hasn't stood the test of time.
but this problem re-occurrs a lot !! and i wonder if there is any way to fix it without voiding the warranty or am i just doomed to be in the dealer every so often
Swap in an LS3!
But seriously, welding it shouldn't and couldn't void your warranty. You aren't doing anything to modify or alter the powertrain.
I have the limited lifetime powertrain warranty that covers the entire powertrain including the exhaust manifold for 99 years. which is great but dealing with the cracked manifolds is a PINtA