San Jose,                            

                                  Ca, 95123

                                  1-866-466-2802

 Optional springs are available from 8.0N/mm to 10.5N/mm

 K-Tech Flow Control Valves (FCV'S) low speed compression adjusters   for the ultimate in low speed tunability are available with 25 clicks of adjustment range on a shallower tapered flow control needle. 

Your only other costs on top of thoe below will be shipping back to you and that will depend on how fast you want them back