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I went through he same process when I was deciding which Bypass to go with.
After some research, I felt the design and flow of the Sharkwerks bypass to be superior. You can see the cutaway of stock restrictions vs their design and also compare this to the Fabspeed U bends on the Fabspeed bypass, etc.
The Sharkwerks team provide exceptional customer service and support in addition. I am totally happy with the bypass from them, and in conjunction with my fistered mufflers the sound is just perfect to me.
If you decide later to add a tubi system for example, you can just change out the secondary mufflers and still keep the bypass to work together with everything else.
Feel free to PM me if you like specifics or details I may not have thought of
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