While definitely not the first workshop to do this, Hirano Tire have taken a few photographs of how they have modified the standard Bilstein Damptronic suspension on their Nissan GT-R to give a 15mm lower ride height. You can see in the photographs they have machined a groove in the shocks which when fitted with a C-Ring stops the springs from extending all the way.

Hirano Tire are now offering this service to customers for 52,000 yen.

Follow the jump to see the detailed images.