There should be no vibration and the car should run normally. An open down pipe should just be loud.
What he said.^^^^
Unless your O2 sensor is near the open end of the downpipe....which can screw up mixture when in closed loop at low throttles.
How is your tune??
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89 LX. 363, single turbo, Super Vic EFI, TFS high port heads by TEA, solid roller, glide. Holley HP EFI. (exact combo varies)