So you want to live the lowlife? Many S2000 owners modify their suspensions for looks and/or improved handling. The factory S2000 suspension was designed very well for it's purpose as it is a hand built sports car, but many want a more aggressive look, stiffer or less stiff ride, and some just want better handling and grip. There are a few ways to accomplish this, through springs, coilovers, or air suspension kits.
Springs will be the most cost effective solution to lower your car. As stated earlier, the S2k suspension was designed for stock ride height, so replacing the springs with aftermarket lowering springs will most likely decrease handling performance. Shorter springs on the factory shocks will alter the geometric design of the suspension causing it to perform worse than stock. The S2000 is a sports car so it doesn't make much sense to spend money on parts that diminish the cars performance. That being said, if you just want to lower your S and daily drive it without much enthusiastic driving, lowering springs may be a decent option for you. If you buy and install a set of springs that hold the same ride height as the the OEM springs the geometry will not be altered just affecting the stiffness of the ride. My recommendation is if you want to buy springs, get something that matches the stock height and improves your ride quality.
The second option is to replace your current spring/shock setup with a coilover set. This is probably the best way to improve the handling of your S2k. If your S is going to see the tracks a lot, a set of coilovers are highly recommended. Coilovers will keep your car planted to the ground, will give you compression and rebound adjustability, ride height adjustability, and improve handling depending on which set of coilovers you choose.
The third option is to buy a full air suspension kit. Lower and raise your car by the flip of a switch. This is definitely the easiest way to adjust your suspension. This will probably be the least cost-effective way to modify the suspension as there are multiple components that need to replaced and added. These parts do tend to wear more easily than springs and coilovers dependent on the type of driving you do. Many air suspensions are not rated for track driving so this may not be the best option for aspiring racecar drivers.
With industry leading brands like Tanabe, Skunk2, ARK Performance, Megan Racing, Eibach, H&R, K Sport, BC Racing, Tien, and KW your S2000 will look more aggressive, handle better, ride better, and/or grip better with a new suspension setup.
Honda S2000 Suspension Buyers Guide
So you've got this sweet S2k and you want to start building it? A lot of people like to lower their cars, but should you start there? The S2000 is a handmade performance machine made to race. With this mindset, Honda developed one an independent double wishbone suspension. This suspension was designed specifically for this car and performs very well. People like to modify their cars in different ways according to how they drive. Let's talk about lowering springs. Lowering springs are generally considered as the low budget option. Most aftermarket manufacturers usually aim to outperform OEM setups. With the S2000 this was not the case. When shorter springs are installed on the S chandelling is sacrificed because the stock suspension was specifically engineered for OEM springs. Other options do exist though. Some manufacturers produce springs that retain stock height but alter ride stiffness. With these springs the suspension geometry is unaffected, but once again the factory shocks were designed for stock spring rate. If all you want to do is adjust stiffness then these springs maybe a good option for you. For an optimal spring set up, replacing shocks is highly recommended. It is important to research the shock and spring combination because if they are not matched properly ride quality can end up worse than stock shocks paired with aftermarket springs. If you really want to improve your handling significantly, coilovers are the best option. Even with these research is key to find a setup. Midrange coilovers are generally better than stock for handling and provide basic adjustability. Finally, air suspension are a good option for daily driving. Most air kits are not recommended for track use as this will cause premature wear. It is always advisable to get an idea of what kind of functions and form you want out of your S and do ample research before making any changes to your suspension.