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Aluminum is soft... If that went down I'd not be worried.

The aluminum passing through will melt during combustion becoming a coating. In this case I expect it will be of minor consequence. You probably have aluminum coated exhaust manifolds, on the inside.

Cheers, Charlie
If It ain't broke, Modify it!
87 Montero turbo Converted back in Spring1989
95 Montero SR 3.8 DOHC Only one?
93 Pajero 3 door 6G75 Mivec with paddle shifted 5 speed
Then a Gen2 SR with full coil independent suspension.