I do have a Z1 HFC so far no rasp but to get out of the noise inside the cabin is quite impossible because as you free up your exhaust it does makes a lot of noise. But you will love it for sure. In fact I come to a point where I feel its to quiet for me now.
Thinking of getting a test pipe in the future. The Ark HFC is a nice recommendation but I find it to expensive. Berk HFC is another option comparable to Z1.
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