The West 50T1. It is worth the extra money.

Yesterday flew my Flip with a Irvine 53 with a Tower muffler. The planes weight the exact same, 5lbs 4oz's and the West blows the Irvine away.

Also, I'm starting to really like the 13-4 on the Hype.

Get the West, just get it, you will never look back.