I installed a Two Brothers VALE complete system on my ZX 14, the one with the stainless pipe and M2 Carbon fiber canister. The quality of the hardware was excellent and the fit was flawless. Everything went together as expected, all the parts fit well, and the installation was easy. My biggest difficulty was getting the pipes to seal at the engine mounting point because it was difficult to get leverage with the tools I had to torque the nuts. The space between the engine and radiator is tight and all I could get in there were 1/4" drive wrenches with short handles. I had to run the engine several times, listen for leaks, tighten the nuts again, and so forth before I stopped all the leaks. I needed 20 lb-ft of torque on the nuts and my torque wrench could only reach the two outside nuts.
The system comes in three parts: the 4-2-1 header is all one piece and welded, then there is connecting pipe to the canister, then the canister itself.
I did it for looks and weight reduction. As a matter of fact, I was not interested in a loud system. TBR makes two different tips I can use to reduce the sound and I installed the P1 tip with reduces db's by 3 to 4. They also make a P1x that reduces db's by 6 to 8. It is louder than I wanted right now with the P1 installed, but I really like the quality of the sound, it's deep and throaty.
I removed most of the plastic to have easy access to the engine manifold
I removed the bolt holding the bottom of the radiator and I pushed the radiator forward as much as I could to have better access, it was still very tight.
Here is a good frontal view
You can see the welds on the 4-2-1 section. This one large welded section fit into the engine bolt location perfectly, they must have a real good jig.
This mid section pipe clamps to the 4-2-1 header and uses the VALE system to attach to the canister. These two joints can swivel and move before tightening, making alignment easy.
An exposed overall view
The clean left side now
Very trim right side
I really like the way it looks
A bit closer to the canister