Worth it? Depends. No doubt more power can be made with the less restrictive exhaust, but it does come at a price. Ive heard many stories of the cutout motors going out (imagine if it were stuck open) and the cutout not sealing right. The idea is great, but from what Ive read/heard the downsides outweigh the benefits IMO.

That being said the one Id recommend would be the DMH unit Welcome to DMH Performance!. Ive heard very mixed reviews about the Quicktime one, and last I had heard they were using inferior parts in their motors and customers were having to send them back multiple times to be replaced.