Originally Posted by FlyLow335i
I believe they are the 4ohm.
Do your boxes look like these? If-so, they should be the 4 Ohm. I believe the SWS-8X are 4 Ohm version and SWS-8Xi are the 2 Ohm version.
I think either version *should* work without a amp, but they definitely have A LOT more in them than what the stock amp can provide.
Also, you have the latest version of the spacers that are machined from the more durable black material.
Good luck with the sale!