Will Toyota honor "exhaust" defect (warranty) if modded?

[Tamago]

it still doesn't make any sense..

step 1. remove stock exhaust manifold.
step 2. install aftermarket "header"
step 3. aftermarket header cracks/breaks/fails
step 4. you work at the dealer so you get your manifold replaced under warranty..
step 5. you now have a stock manifold............ to match the one you have stored in your garage...