03-22-2008, 06:41 AM
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CC Member
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Join Date: Feb 2006
Location: Glenwood Landing or Southampton,
NY
Cobra Make, Engine: Superformance, FRP460 Big Block
Posts: 975
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Not Ranked
I actually agree with Clois but for track use. QA1 has a progressive spring that's 180/600 that's recommended for front track use.
On the street, my progressives give me a nice comfortable ride over small bumps and undulations but grip tight when the springs compress probably around an inch or 2. Perfect for the street with the occasional stop sign bravado. 
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Ray
New York
SPF#1052 11mpg
CAV GT40 MONO29 9mpg
'94 35th Anniversary Rover Mini Cooper 32mpg
'01 MB CL600 V12 18mpg
'08 Volvo S80 18mpg
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