Hi,
Can anyone tell me what the diamiter of the anti roll bars on a 2003 C4S are?

 

Humm....mine are hanging in the garage.

Not sure of the diam. But they are fairly beefy.

Went with H&R's w/ adj drop links for adjustability.

 

Thanks, I was thinking the same as I'm looking ans revamping the suspension.

 

My best suggestion is to do your research, decide what you want, and do it once.

I did mine three times before I got it right.

I first installed H&R springs and it was ok....but felt kinda "floaty" at higher speeds.

I next installed the Bilstein Sport shocks and it was much better...but no dampening adjustability.

Then, I found a killer deal on a barely used set of JIC coil overs withe the right spring rates, full ride height adjustability and 5 way dampening adjustment.

Very happy with them. I can dial them up really stiff for aggressive driving or down for
soft ride around town.

Just depends what you want and how you drive.

 

Here's some sway bar info I compiled before I got my RUF Eibach FSB.
Hope it helps.

C2/GT3 Sways
Normal front 23.1mm x 3.4mm / rear 18.5mm x 2.5mm
ROW M030 front 23.6mm x 3.6mm / rear 19.6mm x 2.6 mm
GT3 front 26.8mm x 4.0mm / rear 20.7mm x 2.8 mm (5 way adj
front, 4 way adj rear, end links needed)
Eibach C2 front 24.0mm x solid / rear 19.0mm x solid (only rear 3 way adj)
H&R C2 front 26mm / rear 23mm - rear only adj

RUF resells Eibach sways (painted green)
Gemballa resells H&R sways

C4S/Turbo
C4S/TT front 23.6x 3.5mm/ rear 21.7x 3.0mm
GT2 front 26.8x 4.0mm/ rear 20.7x 2.8mm
Eibach TT front 24.0mm x solid / rear 23.0mm x solid (only rear 3 way adj)
H&R C4S front 25mm / rear 24mm - both adjustable
TechArt TT front 23.8mm x ? / rear 23 mm x ?? (front and rear 3 way
adj, end links may be needed)

 

Thanks!