If you're looking to take your B6/B7 Audi A4, S4, or RS4 to the next level, let me tell you about the 034Motorsport Adjustable Solid Rear Sway Bar. This isn't just another upgrade; it's a game changer. Built from high-quality spring steel, this sway bar is all about rigidity. If you've ever felt your car lean a bit too much in the corners, this is the fix you need. It’s designed to tackle that pesky understeer while keeping body roll in check when you're pushing hard through turns.

Now, I’ve had the chance to test this bad boy on both the street and the track with our shop's B7 Audi A4 2.0T FSI Quattro, and let me tell you, the difference is night and day. You get the stability you crave without sacrificing comfort for daily driving. That’s something you don’t find with every mod out there.

What’s really cool is that you can use this sway bar with your stock front sway bar. No need to swap out the front unless you want to go all out. If you do decide to stiffen up the front, just know you’ll need an even bigger sway bar in the back to balance things out. But with the stock setup, you’ll notice that body roll is nearly gone, and the car feels so much more responsive—especially when you’re turning in or letting off the throttle.

• Increased Sway Bar Rate: You’re looking at a 100% to 125% increase over the stock RS4 rear sway bar, which is a substantial upgrade.
• Diameter: At 25.4mm, this sway bar is solid and ready to perform.
• Construction: The solid spring steel construction means this thing is built to last.
• Adjustable: It’s 2-way adjustable, so you can dial in the stiffness to match your driving style.
• Compatibility: It’s designed to work seamlessly with the stock front sway bar.

When you order this sway bar, you’re also getting some great extras:

• The 034Motorsport B6/B7 Audi A4/S4/RS4 Adjustable Solid Rear Sway Bar itself.
• Graphite-impregnated urethane bushings for smooth operation.
• High-strength billet aluminum sway bar brackets that are as tough as they come.

As for fitment, this sway bar works with:

• 2002 - 2005 Audi A4 (B6)
• 2003 - 2005 Audi S4 (B6)
• 2005.5 - 2008 Audi A4 (B7)
• 2005.5 - 2008 Audi S4 (B7)
• 2006 - 2008 Audi RS4 (B7)

Important Note: If you’re planning to run this sway bar on the "Stiff" setting, I highly recommend using the latest revision of the factory rear end links or upgrading to 034Motorsport's Adjustable Spherical Rear Sway Bar End Links. It’ll make a difference.

For Lowered Vehicles: If you’ve got your ride lowered, just keep an eye on clearances throughout the suspension’s full range of motion. It’s always a good call to use 034Motorsport suspension components, as they’re designed to work together without any interference.

In short, if you want to enhance your Audi's handling without losing that daily driveability, this sway bar is definitely worth considering.