search is your friend:

Nuespeed Race spring:
Rate: Front- 455 Rear-360
Drop: Front- 2" Rear- 1.75
Linear spring

Nuespeed Sport:
Rate: Front- 250 Rear- 185
Drop: Front- 1.75 Rear- 1.5
Progressive spring
H&R Race spring:
Rate: Front- 460 Rear-350
Drop: Front- 2" Rear- 1.75
Progressively built but those coils are compressed all the way when the wieght of the car is on them. Functions as a Linear spring

H&R Sport spring:
Rate: Front- 276 Rear-276
Drop: Front- 1.75" Rear- 1.5
Front - Linear Rear- progressive
They will not release the spring rate????
Comptech Sport spring:
Rate: F-335 R-135-210
Drop: F-1.25 R-1.25
F-linear R- progressive (of course)

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Eibach Pro kit:
Rate: F&R- 10-15% higher than stock
Drop: F&R- 1.3"
Progressive

Eibach Sport Line:
Rate: F&R- 30% higher than stock
Drop: F&R- 1.7"
Progressive