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I found a 121mm (4.75”) ID coupler over on Aliexpress. It’s a 5mm wall so the OD would be 131mm. 4mm over your 5” dimension. You could use this over your TB and then slide your 5” coupling hose over this if you think you can stretch your 5” hose .157”. It’s made by Hosingtech blue 4ply silicone. $5.63
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2018 ZL-1 Hyper-blue, Heads, Cam, Exhaust, Pulley, CAI, ported TB. 720HP/715TQ.
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