Originally Posted by nssracer
...I noticed they ride much smoother than the Toyos. So today Im thinking of replacing the rear tires to match the Michilens...
Typically, changes to shocks/tires in the rear are far, far less noticeable than in the front. Unless you need to replace the rear tires, I would not do it simply for the sake of a potentially undetectable ride difference.
As you have discovered, there are reasons to run the high priced brands like Michelin. A tire is not just a tire.
You might also consider replacing the front shocks with a brand that has a softer compression stroke valving (like Koni). That too might make yet another big ride difference. Bilsteins tend to have equal compression/extension valving.