YYZ SPRING summary:
v.1 and all the other variants have the same rising (progressive) spring rate and ride quality. The trim height of v.1 is .25 inches front and .75 inches rear HIGHER than all the other variants The front/rear rake was higher with v.1 to help race track turn-in, drag strip launch, and also help HHR which are 300 lbs heavier in the rear than the Cobalt. We made the v.1 springs at a trim ride height at slightly less than stock TC and folks werent happy, wanted more low. ..

v.2 the spring wire diameter was changed to achieve .25 front and .75 rear LOWER to satisfy the "more low" folks. We had found we didnt need as much rake up at the back with folks using our rear sway bars, so that was good; also the rear coils were made larger at the pigtail to help get the isolators on.

Well, folks complained that the isolator fit was TOO loose at the rear pigtail. SO pigtails were tightened up at the rear on the next run, v.3

v.3 was same as v.2 but, like I just said, the rear pigtail was tightened back up to be snug on the isolator, and the plant manufacturing location changed from Logansport IN to Pokotok MIS; but powdercoating and etching was still done at Logansport. The etcher made a mistake and v.3 was labeled v.4 ( wow its hard to keep this straight!).

V.5 are made in MIS, pc'd and etched in MIS, same as v.3 /v.4, and are heading this week(!) to Illinois where we keep our inventory so purchasers dont get Canadian border costs added in.

thats the summary. Thanks for choosing or considering genuine Powell hardcore raceparts!