I'm ready to change spark plugs in my 2012 m37 VQ37VHR engine, what brand plugs other than Denso has anyone used with success. Denso are hard to find at a reasonable price.
Thanks

There has been a history of sorts with people who have used plugs other than OEM. Even if you pay extra for a set that is somehow 'better' than OEM, consider this. You are working on a car that has rep for being picky when it comes to compatibility. Your car was engineered and programmed with a particular spark plug. It would be a shame to go through what will be a knuckle scraping, head scratching chore, only to find that the 'other' brand you bought doesn't work properly and you have to repeat that horrible experience again just to remove and return the plugs. Unless you plan to keep the car for another 100lk miles, this is the only time you will ever change plugs so why not just use OEM?
EG: When I had the dealer change plugs in my M35, I specifically asked for the more expensive, newer version OEM plugs. I was advised by the tech that my engine will run better and smoother with the OEM plug, even though they cost less.

Denso and NGK are the two best brands of spark plugs for Japanese cars. I replaced the spark plugs in my M35x with NGK Laser Iridium plugs at 100K. I ran them for another 65K and had zero problems. With the pricing between the two brands being so close and Denso being the OEM plug, Larz's recommendation is good advice.

This thread was for the M35: howto-change-spark-plugs-m35-vq35de-t497801.html

I would only use factory plugs
That's what all my mechanic friends tell me and it never causes any other issues with the vehicle.
My.02
Andy