When a performance enthusiast first sets out to customize his or her vehicle, the factory springs are usually the first to go. It's almost a universal truth that a lowered car equates to a sportier car, and most people seem to agree with this line of thinking. However, people can't seem to agree upon the best method to achieve the aggressive look.
Some people opt for the high-dollar cost of adjustable-perch shocks, some for the low-buck method of basic lowering springs and others for the no-buck method of cutting coils (which is very dangerous and should never be done).
While adjustable-perch shocks allow for a small range of adjustment, the cost can be prohibitive; they often need to be paired with a set of lowering springs to realize maximum performance potential. Lowering springs are a less costly affair, but don't provide the driver with any range of adjustment other than the spring manufacturer's preset ride height. This is where a coilover system comes to the rescue. By providing a range of height adjustment with a performance-rated suspension spring, one can have the best of both worlds. However, a full threaded-body coilover kit can run well into the $1,000 territory-an investment that the first-time enthusiast oftentimes can't readily afford.
Weapon R recognized this problem and attacked it head-on. Instead of building a complete shock assembly with an adjustable perch, it created a threaded sleeve that slides around the existing shock. This design allows for an almost infinite range of height adjustment without the high price of a full coilover system. By pairing the sleeve with a set of rate-specific performance springs, Weapon R produced the ultimate convergence of affordability and function-Circuit Pro coilovers.
 Loosen the 14mm nuts that...  Loosen the 14mm nuts that hold the top perch, but don't completely remove them yet. This allows you to remove the bottom bolts easily without having the entire spring and shock assembly fall on you. |  Disconnect the brake line...  Disconnect the brake line bracket and the 14mm nut that clamps the bottom of the shock. After removing the bottom of the shock from the fork, remove the loosened 14mm nuts on top and take out the entire assembly. |  Using a spring compressor,...  Using a spring compressor, remove the factory upper spring perch, dust sleeve, bump stop and all the washers. Then slide the plastic alignment sleeves and the threaded aluminum sleeve onto the shock. Trim any excess plastic from the alignment sleeve. |