looking at getting psi pipes. are they any good? some say good, some say junk. so are they good or bad?

I had them on a 94 T-cat w/a Genisis motor. They rocked with that motor. I've only seen them on cats but they were a quality pipe that made a difference for sure. I even used to use them way back on my race bike.
Caleb

I was just on their site looking at the twin pipes for my 00' MXZ 700. Has anyone evr had these on their sled? Is it a good move to go for the twins?

thats what I was thinking about doing to my 00.mxz 700 too. they sure sound good to me.