Tag Archives: 9-inch

Tech: 2015 Mustang Bolt-In 9-inch IRS

To the Nines

Watson Racing developed a new 9-inch IRS for straight-line S550s

By Steve Turner
Photos courtesy of Watson Racing

From the moment it was announced that the 2015 Mustang would feature an independent rear suspension, many of us started to fret about how the new pony car would handle drag strip launches. As it turns out, the cars have performed quite well with moderately enhanced power levels, but as we head into the first full racing season since the S550s hit the streets, some cars might need a more durable option, and that’s what Watson Racing has created.
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News: 2015 Mustang IRS Upgrades

Independent Enhancements

The Driveshaft Shop and Lethal Performance team up to offer 2015 Mustang IRS upgrades

By Steve Turner
Photos courtesy of The Driveshaft Shop and Lethal Performance

The drivetrain experts at The Driveshaft Shop have gotten their hands on a complete Independent Rear Suspension assembly from a 2015 Mustang. They are currently developing a host of upgrades for the car, and these parts will be available from Lethal Performance.
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