View our Specials! Coupon Code: SaveIn2026
Looking to upgrade or modify your Buick GS 400 with aftermarket parts from UMI Performance? At Tunersports.com we carry a great selection of their parts for your vehicle.
From drivetrain, ball joints, suspension or sway bars we have 107 parts available for your GS 400, all with free shipping to the Continental US 48 States.
 $62.69
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 OUT OF STOCK UMI Performance Coilover Kits 4057-225UMI Performance 64-72 GM A-Body Rear Coilover Kit (225LB Spring Rate) $1,149.84
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OUT OF STOCK UMI Performance Coilover Kits 4069-5UMI 64-72 GM A-Body Coil Over Conversion Brackets Kit -1in to +1in Ride Height - 225lb Spring Rate $1,235.81
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OUT OF STOCK UMI Performance Coilover Kits 4069-3UMI 64-72 GM A-Body Coil Over Conversion Brackets Kit -2in to -3in Ride Height - 250lb Spring Rate $1,235.81
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OUT OF STOCK UMI Performance Coilover Kits 4069-6UMI 64-72 GM A-Body Coil Over Conversion Brackets Kit -1in to +1in Ride Height - 250lb Spring Rate $1,235.81
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OUT OF STOCK UMI Performance Coilover Kits 4069-4UMI 64-72 GM A-Body Coil Over Conversion Brackets Kit -1in to +1in Ride Height - 175lb Spring Rate $1,235.81
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OUT OF STOCK UMI Performance Coilover Kits 4069-1UMI 64-72 GM A-Body Coil Over Conversion Brackets Kit -2in to -3in Ride Height - 175lb Spring Rate $1,235.81
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$349.99
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OUT OF STOCK UMI Performance Coilover Kits 4069-2UMI 64-72 GM A-Body Coil Over Conversion Brackets Kit -2in to -3in Ride Height - 225lb Spring Rate $1,235.81
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OUT OF STOCK UMI Performance Coilover Kits 4057-175UMI Performance 64-72 GM A-Body Rear Coilover Brackets Bolt In (175LB Spring Rate) $1,149.84
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 IN STOCK UMI Performance Lower Control Arms 4015-BUMI Performance 64-72 GM A-Body Tubular Lower Control Arms $234.84
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 IN STOCK UMI Performance Sway Bars 403534-RUMI Performance 64-72 GM A-Body Solid Front and Rear Sway Bar Kit $419.99
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 IN STOCK UMI Performance Lower Control Arms 4016-RUMI Performance 68-72 GM A-Body Tubular Non-Adjustable Upper Control Arms $160.04
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 IN STOCK UMI Performance Sway Bars 4034-RUMI Performance 64-72 GM A-Body 1in Solid CrMo Rear Sway Bar $178.74
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 IN STOCK UMI Performance Sway Bars 4035-RUMI Performance 64-77 A-Body 70-81 F-Body GM Front Sway Bar 1-1/4in Solid $262.89
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 IN STOCK UMI Performance Lower Control Arms 4016-BUMI Performance 68-72 GM A-Body Tubular Non-Adjustable Upper Control Arms $160.04
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 IN STOCK UMI Performance Strut Tower Braces 4058-BUMI Performance 68-72 GM A-Body Rear Shock Tower Brace Bolt In $169.39
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 IN STOCK UMI Performance Sway Bars 4034-BUMI Performance 64-72 GM A-Body 1in Solid CrMo Rear Sway Bar $178.74
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 IN STOCK - LOW UMI Performance Hardware Kits 4004UMI Performance 64-72 GM A-Body Upper & Lower A-Arm Mounting Hardware $55.21
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IN STOCK - LOW UMI Performance Strut Tower Braces 4058-RUMI Performance 68-72 GM A-Body Rear Shock Tower Brace Bolt In $169.39
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