Purchased a 2002 XJ8 for an LS engine swap. XJ8 had a bad tranny and I've sold the engine. Thinking of buying a 2001 XJR will frame damage and a salvage title. I would be selling the engine and tranny. Reasons for getting XJR are larger asteroid wheels, brakes and suspension parts. May also use seats and other interior pieces. XJR is not local so won't be inspecting before hand.
Questions:
Were the Brembo brakes standard on a 2001 XJR or an option?
I'm sure adding the XJR brakes requires swithing the entire hub. Does an XJR hub fit on an XJ8?
What are the other suspension differences between a XJ8 and an XJR? Springs same? Sway bars same?
Is the radiator the same? Might be nice to have a bigger one for the LS.
I know the XJR has a second fuel pump. Is it in the tank or on the fuel line?
Anything else I've missed other than cosmetic items?

 

XJR sliding caliper front bracket is all you need then you can fit the larger 325 front rotors.

early brembos use an adapter bracket late brembos just need knuckle to be tapped. a car on asteroids will not come with these brakes and they’re not worth the effort to fit anyways

XJR and most XJ8 has rear stabilizer bar that LWBs don’t. XJR springs are different, some XJRs have green adaptive shocks others have green sport shocks.

dual pump setup is in the tank

 

That might be a less expensive way to obtain the wheels. It would be nice
as long as there was no damage. Interior colors are difficult to match.

 

Brembo calipers were always an option through out the XJR production years ( except XJR100) AKA R1 package.

but R1 package includes also different style and larger wheels.

you can retrofit the R1 package on a non Brembo X308 with a few additional hardwares.

 

If I understand, all XJR100s had the Brembo package. Some regular XJRs had the Brembo package as an option, but then it would not have Asteroid wheels. I checked rotor part numbers for a XJ8 and a XJR on RockAuto and they came up the same, so XJRs (unless R1 package) and XJ8 use the same brakes.

 

Around year 2000 xj8 started to have 325mm brakes as standard. Instead of earlier 300mm.

 

Surely, no one would buy a wrecked car just to get the brake package. However, there may be enough parts that are interchangeable that it would be worth it. There is almost always a hassle when trying to use different year/different model parts.