How much would you pay for a product made in the US vs China

An individual buying US made car parts won’t help the us economy, reverse the exportation of labor, or really have any effect other than drain your wallet. If it’s the same part, there is no way I’m paying more for US manufacturing. That does nothing to help anyone. The decision to export labor overseas was made by politicians in the last century and is not the responsibility of the consumer.

If on the other hand buying domestically made parts is incentivized by drastically higher quality, the argument can change. But for many things, china does a pretty damn good job and is far more cost efficient (by compromising on ethics yes) than US manufacturing will ever be.

So given your proposal, I’m paying 0% more.