Please post pictures of front and rear springs before it's installed. If possible, provide the height of the springs (length of front/rear). The inner side diameter of the spring. If available post the spring weight/mm.

I really want 10% stiffer than stock.

 

I'm not sure you'll be able to get anyone to say their springs are "10% stiffer than stock" because unless you get them on coilovers, they are progressive rate. Sring rate goes up on these as they are compressed. Manufacturers design them to increase at different compression lengths with initial rate very close to stock rate.

 

well, just say that I want it stiffer than stock but not by much. coilovers are still an option.

 

Coilovers would be nice but from my reading, it looks like you would lose the cockpit adustable shocks. Hopefully someone will come out with a direct replacement.

 

https://www.clublexus.com/forums/gs-...ch-drop-2.html

 

Thanks!

Here is Hyperco calculator.
http://www.hypercoils.com/spring-rate-calculator/

http://www.hypercoils.com/bellows-calculator/

I will end up getting swift springs...can't see myself doing any other brand. With the swift springs, it won't sag or "settle" over time. Buy it once and forget it. The ride height is more consistent on all sides.
http://www.northamericanmotoring.com...gs-dynoed.html