Removing Rust from the Standard Exhaust

[69oldskool]

Never heard of rust removal by electrolysis. Got a link?
Is it normal for the collector to rust far worse than the downpipes?
My collector is like cheese but the downpipes are fine. Shame I have to replace the whole thing because of a shitty few inches in the middle.

It works~ you're gona need a big tank for an exhaust system though.

For smaller items,You can do it with a battery charger, a solution with a couple of tea spoons of baking soda, a clean steel piece of steel for one electrode & your rusty (but cleaned) item for the other.& a suitable plastic container.
Can't for the life of me remember which way round +ve & -ve go but i'm sure you could work it out from first principles.iron has Fe+ ions i think..