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I'm not a tuner, but I would say it depends on how effective the port job is. If you are removing enough material to move additional air at the throttle body, it could need tune tweaking. Being tuned for a 95mm will leave you pretty close, but increasing the cross sectional potential for air volume at various throttle positions might be just enough to either leave power/throttle response on the table or potentially cause drivability issues. Going from 87mm to a full 95mm port is a decent jump in volume potential. The tune for the throttle body accounts for most of it, but I think adjustment will be needed. Maybe the computer will see it and compensate, I'm not sure.
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2019 1SS1LE M6 Shadow Gray Metallic
ProCharger D1X Race Kit - 4.25" Pulley || GPI Pistons/Rods - ACL Bearings - ARP Hardware || LME Timing Chain Guide || Katech C5R Timing Chain || Katech OE Spec Billet Oil Pump || OE Ported Heads || CHE Trunnion Upgrade || BTR 220 Cam - BTR .660" Dual Springs - GM Racing "Caddy" Lifters - BTR 3/8" Pushrods (7.825") || ATI Balancer || LT4 Injectors || LT4 HPFP || JMS BAP || DSX Flex Fuel || LT2 Intake Manifold || LTH (Catless) || Stainless Works Redline Series NPP || 91 + 8oz Boostane
7/26/2024 Tuning in progress
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