And just added in the sway bars as well.
I had hotchkis sways on my Audi RS4 and they helped the car rotate a lot!
http://www.hotchkis.net/2011-2012-mustang-rear-suspension-package.html
http://www.hotchkis.net/05_mustang_sport_sway_bars.html
http://www.hotchkis.net/20052011-ford-mustang-sub-frame-connectors.html
REAR SUSPENSION PACKAGE
The Hotchkis Sport Suspension Rear Suspension package for the 2011-2012 Mustang is designed to improve all the key components in the rear suspension improving traction and reducing wheel hop. The package includes adjustable Upper Trailing Arm, Lower Trailing Arms, and a adjustable Panhard Rod. The adjustable upper trailing arm design makes pinion angle changes a breeze while the high articulation 7/8" heim joints allow for adequate suspension twist for maximum articulation and minimal suspension bind up. The hi tech lower trailing arms featuring TIG welded I-Beam construction for maximum strength to weight ratio with greasable swivel max polyurethane bushings to increase suspension articulation while maintaining a quiet, comfortable design. The adjustable panhard rod is designed to allow adjustment for changes to ride height and improves cornering traction by reducing suspension flex. The rear suspension kit is finished in gloss black powder coat for durability and is a direct bolt in installation that can be done in minutes. The Hotchkis Rear Suspension Package is a must have finishing touch for any high performance 2011-2012 Mustang."
Features:
Adjustable upper trailing arms with high articulation 7/8" heim joints and CNC machined 1.5" bodies.
Lower Trailing arms feature TIG welded I beam steel construction creating a strong, yet light weight part while greasable Swivel Max polyurethane bushings.
Adjustable pan hard rod with greasable bushings.
Bolt in installation, no modifications required.
SUB FRAME CONNECTOR
Hotchkis Sport Suspension Sub Frame Connectors for the 05-12 Mustang are designed to add rigidity to the chassis to improve vehicle performance by reducing chassis flex. Fabricated from 1" x 2' x .095 wall rectangular steel for maximum ground clearance, these TIG welded connectors are powder coated gloss black. Installation of these connectors does not require modifications or cutting of the floor boards. The connectors bolt directly into the car using existing mounting points and can be done in minutes. Hotchkis Sub Frame Connectors are a must have, finishing touch for any high performance application.
Features:
Powder Coated Gloss Black Finish.
TIG Welded construction.
Fabricated from 1" x 2' x .095 wall rectangular steel.
Slim Fit Maximizes Ground Clearance.
Bolt In Installation, No Modifications Required .
SWAY BARS
Specs:
1.5" (38.1mm) Tubular Front Bar, 4 Way Adjustable.
1" (25.4mm) Tubular, 3 Way Adjustable
Weights (Bar Only) Front 13lbs Rear 9 lbs
Specs vs GT 500 Stock
Hotchkis Front:
Hole 1: 45% stiffer than GT500
Hole 2: 65% stiffer than GT500
Hole 3: 85% stiffer than GT500
Hole 4: 105% stiffer than GT500
Hotchkis Rear:
Hole 1: 5% stiffer than GT500
Hole 2: 25% stiffer than GT500
Hole 3: 45% stiffer than GT500
Specs vs 2011 5.0L
Hotchkis Front:
Hole 1: 45% stiffer than 5.0L
Hole 2: 65% stiffer than 5.0L
Hole 3: 85% stiffer than 5.0L
Hole 4: 105% stiffer than 5.0L
Hotchkis Rear:
HP setting 1 = 120% stiffer than 20mm rear
HP setting 2 = 160% stiffer than 20mm rear
HP setting 3 = 200% stiffer than 20mm rear

I had hotchkis sways on my Audi RS4 and they helped the car rotate a lot!
http://www.hotchkis.net/2011-2012-mustang-rear-suspension-package.html
http://www.hotchkis.net/05_mustang_sport_sway_bars.html
http://www.hotchkis.net/20052011-ford-mustang-sub-frame-connectors.html
REAR SUSPENSION PACKAGE
The Hotchkis Sport Suspension Rear Suspension package for the 2011-2012 Mustang is designed to improve all the key components in the rear suspension improving traction and reducing wheel hop. The package includes adjustable Upper Trailing Arm, Lower Trailing Arms, and a adjustable Panhard Rod. The adjustable upper trailing arm design makes pinion angle changes a breeze while the high articulation 7/8" heim joints allow for adequate suspension twist for maximum articulation and minimal suspension bind up. The hi tech lower trailing arms featuring TIG welded I-Beam construction for maximum strength to weight ratio with greasable swivel max polyurethane bushings to increase suspension articulation while maintaining a quiet, comfortable design. The adjustable panhard rod is designed to allow adjustment for changes to ride height and improves cornering traction by reducing suspension flex. The rear suspension kit is finished in gloss black powder coat for durability and is a direct bolt in installation that can be done in minutes. The Hotchkis Rear Suspension Package is a must have finishing touch for any high performance 2011-2012 Mustang."
Features:
Adjustable upper trailing arms with high articulation 7/8" heim joints and CNC machined 1.5" bodies.
Lower Trailing arms feature TIG welded I beam steel construction creating a strong, yet light weight part while greasable Swivel Max polyurethane bushings.
Adjustable pan hard rod with greasable bushings.
Bolt in installation, no modifications required.
SUB FRAME CONNECTOR
Hotchkis Sport Suspension Sub Frame Connectors for the 05-12 Mustang are designed to add rigidity to the chassis to improve vehicle performance by reducing chassis flex. Fabricated from 1" x 2' x .095 wall rectangular steel for maximum ground clearance, these TIG welded connectors are powder coated gloss black. Installation of these connectors does not require modifications or cutting of the floor boards. The connectors bolt directly into the car using existing mounting points and can be done in minutes. Hotchkis Sub Frame Connectors are a must have, finishing touch for any high performance application.
Features:
Powder Coated Gloss Black Finish.
TIG Welded construction.
Fabricated from 1" x 2' x .095 wall rectangular steel.
Slim Fit Maximizes Ground Clearance.
Bolt In Installation, No Modifications Required .
SWAY BARS
Specs:
1.5" (38.1mm) Tubular Front Bar, 4 Way Adjustable.
1" (25.4mm) Tubular, 3 Way Adjustable
Weights (Bar Only) Front 13lbs Rear 9 lbs
Specs vs GT 500 Stock
Hotchkis Front:
Hole 1: 45% stiffer than GT500
Hole 2: 65% stiffer than GT500
Hole 3: 85% stiffer than GT500
Hole 4: 105% stiffer than GT500
Hotchkis Rear:
Hole 1: 5% stiffer than GT500
Hole 2: 25% stiffer than GT500
Hole 3: 45% stiffer than GT500
Specs vs 2011 5.0L
Hotchkis Front:
Hole 1: 45% stiffer than 5.0L
Hole 2: 65% stiffer than 5.0L
Hole 3: 85% stiffer than 5.0L
Hole 4: 105% stiffer than 5.0L
Hotchkis Rear:
HP setting 1 = 120% stiffer than 20mm rear
HP setting 2 = 160% stiffer than 20mm rear
HP setting 3 = 200% stiffer than 20mm rear
