lol - oh boy - here comes the slippery slope
the 21 will probably be too stiff for the stock torsion bars - if you plan to increase the rear spring rate, then that would be different - but then the 30mm and H&R springs will probably end up being too soft - pretty much any spring you can find that you add back there will make the front too soft - you could use a 50lb helper in the back, and not have to change anything in the front, but good luck figuring that out or finding it
that being said, i have a 22 in the rear, and am very happy with it, but i also have 500lb springs (no torsions) which makes about a 300lb wheel rate versus the stock 175 - however, this is coupled with a 32mm bar up front and 300lb springs
all of this though also required installation of hydraulic (not gas) dual adjustable shocks and struts to smooth the ride out
the result is a touch of controllable oversteer, and a very smooth ride - exactly what i wanted
it's all about balance
94 Midnight Metallic Blue Cab Porsche 968 w/deviating cashmere/black interior and WAY too many mods to list - thanks to eric for creating
www.968forums.com
"It isn't nearly as expensive to do it right as it is to do it wrong."