I found some anti-roll/stiffening bars for the XJ8 (X308) but would these also fit the XJR X308? I'm assuming they would unless anyone knows better?

https://ultraracingshop.com/products...pr_seq=uniform

https://www.ebay.co.uk/itm/174662975266

Alternatively, does anyone know of any good quality bars that could firm up the handling of a 2002 XJR X308? Thanks in advance.

 

XJR has a rear ARB, the XJ8 doesn't. The R also has Sport or Super Sport suspension. This includes front and rear ARB's.
If your car is on original shocks and springs it should be compliant but not soft. Up the tire pressures all round and see how it performs. Inspect all bushes and suspension componants. Is the car CATS equipped?

 

Out back you can use an XKR rear sway bar, gets you from 15mm to 17mm. As noted check to ensure you're equipped with the rear bar, otherwise you'll need to add the bracket (not impossible, but not fun).

 

Swallows racing in Bristol do a rear brace to improve handling for x308 and x100, as well as other bits and pieces
I don’t have it fitted myself but when talking to them, they say it’s plug and play.

https://swallows-jag.co.uk/product/s...r-brace-coupe/

 

Great, thanks Cafcpete, just what I was looking for!

 

Im not quite sure where this goes or what it is supposed to do?