Pipewerx exhaust sound, replacement for Arrows?

I had a Pipewerx slip-on exhaust on a G2 model ZX6R, the one I bought didn't take the exhaust stock flange. I contacted them, they were very helpful and said that they had ran out of the material (chrome finish) to send a replacement but asked for the flange measurement and made a special carbon-fibre system retailing @ 120%+ to the value of the original I had purchased and I received it the next day and they collected the old one at the sametime.

The customer service from them is truly exceptional, the build quality was amazing. But the sound.. without their special logo lasered baffle, it rumbled at low RPM and would vibrate the world @ 15krpm. It wasn't any louder than an Arrow/ Akrapovic system until it was opened above 5krpm.

 

Not a problem, I was expecting the wait until more material is in or a refund option.. But when they said about upgrading it for free.. Well that shocked me!

 

Yeah, it's just the others they do have the X in the baffles.. well used to 4-6 years ago