[hks_kansei]

JDM Tax.

Same reason my RS*R was $500 for what is essentially a stainless milo tin with a pipe out each end.



I think the main reason is that it's a known item.
You can easily jump on youtube and search for "Apexi N1 on Miata" and find exactly that, and know what it sounds like.

Whereas a custom piece, you don't know what it's like until you get it on the car. (generally)

 

[hks_kansei]

Sorry, I didn't acutally look on youtube.

More a general example to explain that because it's a brand name thing one will be the same as another.
I randomly chose Apexi, probably a bad choice without having looked to see if it's on there.
In that case, just pretend I said another brand that's more common

Same as a Big Mac is the same in every state, so you know what you're getting.