Is it OK to wire two 8 ohm subs to 4 ohms?

-I have two 8 ohm kenwood subs and i wired them parallel (creating a 4 ohm load). My amp is stable at 4 ohms. A friend told me that wiring 8 ohm subs down to 4 ohms will damage the subs or the amp. Is this true, or will my setup be ok?ohm's is just a measure of resistance a sub manufacturer puts on there subs so you know type of resistance each sub has most subs are fine at 2 ohm loads but remember lower resistance = more power...more power makes more chances to clip the amp or bottom out the sub(both are bad) ive wired 6 subs to 1/2 ohm and they do fine you just cant overpower them or else you will damage your equipment(easy to do at that low of resistance)
8-ohm car audio subs exist so that they can be combined together to make a 4-ohm load. Provided your amplifier is stable at 4 ohms (like every other car audio amplifier on the planet) you won't have any problem at all. You're using them exactly like they're meant to be used.
No, you might never know what will happen, BUT for safety reasons, Wear safety gloves, helmet and stuff, and just be really careful if you try
Your setup is OK. Your friend is wrong.