I think it's only 2mm bigger than a stock S4 bar and it's adjustible.

The topic of the S4 rear bar on an A4 or 90 had been brought up in the past in the 12v Development forum and I don't remember anything about this bar.

TIA for any feedback!<ul><li><a href="http://www.pure-motorsport.com/products/description.php/II=722/CA=214/PA=7">17mm adjustible rear sway bar</a></li></ul>

I think it would not be beneficial unless you were upgrading an old A4 that came with the 11mm rear bar. Going from 16 to 17mm will not be noticable to 99.9% of the population.

H&amp;R manual supplied with the kit is incorrect. The diameter of the bar is actually 21mm. I talked to the guys from ecstuning.com and they confirmed and updated their web site. Also check the H&amp;R web site for correct spec.