Stabila Corse MK2/MK3/MK4 Rear Torsion Bar (28mm)
$169.99
SKU: SC5617
This internal solid torsion bar is just what your Mk2, Mk3 (Includes Corrado) or MK4 needs to give the car quick turn in and improved mid-corner response. Unlike conventional sway bars - this torsion bar gives you the benefits of a 28mm sway bar, but in a more compact package. With solid spring steel construction, and durable gloss silver powdercoat finish this bar will stand up to anything you can throw at it. Install is simple and all necessary hardware and instructions are included. Recommended for occasional track use and race applications, also great for those who need the additional ground clearance of having an internal rear sway bar. This torsion bar in no way changes the ground clearance of your vehicle, unlike other standard style sway bars, which will drop below the rear twist beam. *WILL NOT FIT GLI/337/20th WITH PRE-EXISTING TORSION BAR
**Some cars may come equipped with a smaller factory torsion bar with a rubber bushing in the center. This bushing will need to be trimmed to install this Stabila torsion bar.
Why a Solid Bar Over a Tubular One? Though tubular bars are lighter and hold that advantage over the solid bar, that�s the only real advantage that the tubular bar would hold over a solid. All other advantages belong to the solid bar: 1st Advantage - For any given diameter, a solid bar will have a higher capacity to resist torsional load than a hollow bar � mainly because that stress, while mostly focused on the outer edge of each bar, is more evenly distributed though a solid bar vs only being distributed though the inner and outer walls of a tubular bar. Quite simply a solid bar is stiffer than a tubular bar of that diameter, and is equivalent to a thicker tubular bar of the same material. When comparing a solid sway bar with a tubular bar, you need to subtract the inside diameter (i.e. wall thickness times 2) to the fourth power from the outside diameter to the 4th power, and then take the fourth root of the both figures. For this example we will use a standard wall thickness that is used by some manufacturers - 4mm, and compare it to our 25mm solid bar. We also assume we are using the same material and lever arm length. Here is the basic equation: SD =(4th Root((OD^4)-(ID^4))) SD : Solid Diameter OD : Outside Diameter ID : Inside Diameter Based on this wall thickness (4mm) A 27mm tubular bar would be the rough equivalent to our 25mm solid bar. 
2nd Advantage � The ends of a tubular bar, whether they be sleeved, welded, or pinched can all be a weak point of the bar design. A solid bar uses stamped, forged ends � making the ends the strongest part of the bar. 3rd Advantage � Design flexibility, the mandrels required for tubular bar design can often restrict certain shapes � this is not an issue with solid construction, it is much more effective in making complex shapes. 4th Advantage � The solid sway bar is just simpler � you wont ever have to worry about what the wall thickness is, or if it was bent/assembled properly. And you won�t ever have to deal with this: 
**Some cars may come equipped with a smaller factory torsion bar with a rubber bushing in the center. This bushing will need to be trimmed to install this Stabila torsion bar.
Why a Solid Bar Over a Tubular One? Though tubular bars are lighter and hold that advantage over the solid bar, that�s the only real advantage that the tubular bar would hold over a solid. All other advantages belong to the solid bar: 1st Advantage - For any given diameter, a solid bar will have a higher capacity to resist torsional load than a hollow bar � mainly because that stress, while mostly focused on the outer edge of each bar, is more evenly distributed though a solid bar vs only being distributed though the inner and outer walls of a tubular bar. Quite simply a solid bar is stiffer than a tubular bar of that diameter, and is equivalent to a thicker tubular bar of the same material. When comparing a solid sway bar with a tubular bar, you need to subtract the inside diameter (i.e. wall thickness times 2) to the fourth power from the outside diameter to the 4th power, and then take the fourth root of the both figures. For this example we will use a standard wall thickness that is used by some manufacturers - 4mm, and compare it to our 25mm solid bar. We also assume we are using the same material and lever arm length. Here is the basic equation: SD =(4th Root((OD^4)-(ID^4))) SD : Solid Diameter OD : Outside Diameter ID : Inside Diameter Based on this wall thickness (4mm) A 27mm tubular bar would be the rough equivalent to our 25mm solid bar. 2nd Advantage � The ends of a tubular bar, whether they be sleeved, welded, or pinched can all be a weak point of the bar design. A solid bar uses stamped, forged ends � making the ends the strongest part of the bar. 3rd Advantage � Design flexibility, the mandrels required for tubular bar design can often restrict certain shapes � this is not an issue with solid construction, it is much more effective in making complex shapes. 4th Advantage � The solid sway bar is just simpler � you wont ever have to worry about what the wall thickness is, or if it was bent/assembled properly. And you won�t ever have to deal with this: