to date really nothing to speak of
ive been working with wheel 2 wheel (designers of the STSi and Tim Allens DTSi) as well as westers tuning
i also have the prototype JET chip, the only fruit of the X-M-S along with caddyperformance joint venture to make a supercharger for our cars.
www.cardomain.com/id/CadillacETCi have this board to thank for the Lucerne Brake mod i preformed on my 03 STS
heres a list of performance parts used on the STSi some of which may be useful on the Aurora this comes from wheel 2 wheel
Here are a few parts you may be able to track down, which will work with almost any generation. I’m not surprised to hear that about the springs. If you can’t order these parts from a dealer, I don’t know how to get them, but I think a fair amount of them were created for heavier limo packages, but create a firmer performance oriented feel in a standard weight vehicle.
Strut Tower Brace 25653157
Intermediate Shaft- Steering 26073020 (I think these became standard in 2002)
Stabilizer Bar- Front 25649664
Bushing- Craddle Mount Front 25665905
Suspension Cradle- Rear 88890012
