[TGSI Racing]

Wow... where to begin. First cutting the springs makes them stiffer... so if you cut them an inch, then you didn't lower the car an inch 'cause they don't sag as far 'cause they are stiffer.

Cutting springs also requires you cut them exactly the same... assuming that they started out the same. Or if they started out different and you cut them different, they could end up the same... or you could end up EVIL.

Lowering the rear without making appropriate changes to the front can also make it EVIL. With a lower and stiffer rear, the roll center is moved in the rear, but not in the front. EEEVIL

I could go on, but I think you get the idea. Call the Opel GT Source and get springs & sway bars, both front and rear and you will have a balanced car.

And since you mentioned an adjustable panhard bar... I have just finished a "kit" late this afternoon for the rear suspension trailing arms, and panhard bar. Here's a pic

 

[TGSI Racing]

The trailing arms are $85 each including rod-ends, but without the bushings/offset spacers.

The Panhard bar with rod ends and again without bushings is $95.

The trailing arm bushing/offset spacer set has 4 different size spacers per side to accomodate the offset in the chassis to rear end mounts... the set is $85

The panhard bar bushing set is $40.

I am doing all the pieces seperately so folks can repossition the mounts for all of the pieces if they want... especially the panhard bar.

If anyone wants the complete kit, it will be 10% less... or $351