That is how the QTP cutouts work. Like miner99 mention, they fit right were the side pipes connect to the H-pipe. So when they are closed all the exhaust will travel through the GT500 AB, when open exhaust will go through all 4 points.


The plus with QTP cutouts is you can adjust how much sound you want going to the side exhaust by opening a little or all the way. I had one QTP fail on me, but the company was great about taking care of the problem.

 

tbone has it explained simply and well. cut outs closed exhaust just through the axle backs. Open through all four exhausts. Dial in the sound you want

 

I wish there were some manually operated cut-outs that could be mounted with the Boss quad exhaust. I imagine I would be keeping them in the same position (open) most of the time- but I might want to close them when I'm headed to the airport (parking garages really amplify exhaust).

I've seen manually operated cutouts at Summit, but they don't have the proper bolt pattern (every one I've seen has 3 triangular spaced bolt holes).