well, I got a kakimoto cat back, but the muffler was replaced with an american made N1 copy. I got front and dump pipes as well.
Got it tested yesterday for noise and with silencer I'm JUST bordering on legal (90-91db I'm getting, limit is 90).
Without silencer I got 92-93db.
With silencer was @ 3,200RPM
Without was around 3,000RPM