| The quietest aftermarket system i could find was the Fujitsubo Legalis R: [ www.fujitsubo.co.jp ] It has an h-pipe in the middle, and two large exits. It's all stainless steel. I bought mine here in japan so it was reasonably cheap - i expect it'll cost you a bit more though. It looks very simiar to the HKS or A'pexi but is much quieter.
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