What is the difference between the tein h and s tech springs for the g35 coupe vs the 350z. What are the drop differences, price difference and which is reccommended. Where is a good place tp purchase either.

 

The spring rates are different and the amount of drop is also different between the G and Z. S techs provide more of a drop than the H techs.
You can view the details on the springs here http://tein.com/products.html
The price difference is just a couple of bucks. You can find them at everythingg35.com