Namura is the one your talking about, but the namura is a cast piston and the wiseco is a forged. As long as your jetted for your mods and dont have a leak in your motor, it would be best to spend the extra 20 bucks on a piston that will last twice as long.
I don't mix the gas.. There's a separate spot for the 2 stroke oil
How much will it cost to get a shop to do it?
I dont have a leaks own tester.. Is it worth getting? Don't you just put it in the spark plug spot then give it a kick