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Has anyone used a Flowtech Warlock Bypass Muffler?
Looks like a neat concept to basically put the cutout in the muffler. Would be easy to add electric cutouts to it.

I have used them and when first bought it was thinking the same for using with electric cutouts, until I took the insert out- you can see in the pic it has a angle built into it to help the exhaust flow when closed. With the electric cutout the exhaust would be going straight into a flat wall the majority of the time, so I didn't try using it that way. Anyway they sound pretty good IMO- throaty and not too loud when closed and pretty much just a straight pipe when open.
 

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I tried them a few years ago on my old '40. In fact, they are still on it but the truth is there is no performance benefit to them.

It pulled a 1.51 7.10 @ 96 with them open or closed.
 
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