RX7 FC Turbo HKS Silent Hi Power exhaust test pipe

my 91 s5 rx-7 turbo II fc with 3“ straight exhaust with HKS Silent Hi Power launched like shit street port 3mm seals dowel pins power FC stock turbo test pipe rx7 s4 s5 supra 13b 13bt 20b 12a skyline rb20 rb25 rb26 2jz 1jz r154 w58 honda vtec yo