1990-1991: L & M models
"If ever the GSX-R peaked, it was here. Everything works well together - 38mm carbs, much better head design, slightly higher compression. It's been properly tuned by the factory from the previous model. Stage 1 tuning is easy: a Yoshimura Duplex exhaust, Stage 3 Dynojet kit and individual K&N air filters. We've seen 116bhp from Ls and Ms with those mods alone: brilliant!"
"There's nothing actually wrong with the airbox design and, if you want to keep it for road use, stick a Stage 1 jet kit and replacement K&N filter in and you'll see 105bhp (3bhp more than a stock 1995 model). Either a Yoshimura or Cobra race can, used in conjunction with a Stage 3 jet kit, will give you an 8% power increase. Bung on a can by itself and that figure is still going to be around 6%."
"If you want big, big power gains, fit a full Yoshimura exhaust and a set of 38m,m Mikuni flatslides. these carbs just pump so much air and fuel into the engine that a 24bhp power increase at peak is totally possible. Again, fit a 5 degree ignition advancer to crispen the acceleration, and our drop-in cams should add another 6% to that power increase."
1992-1995: WN, WP & WR models
"Stage 1 Dynojet kit in the airbox, K&N replacement filter, Yoshimura slip-on can. That'll give you a guaranteed 110bhp with more to come, no trouble at all. Skorpion does a system for the water-cooled GSX-Rs and the results I've seen from them are excellent, Worth getting if you can afford it."
"These bikes are pretty peaky, so you don't need an ignition advancer as with the other models. They run much leaner than earlier GSX-Rs, so an open exhaust by itself is a bad idea. Run the engine on four-star - that goes for all the GSX-R series - but other than that, most of the tuning mods are the same as the M model."
"For handling, Pirelli Dragons are the tyres to go for every time. Try Ron Williams at Maxton for suspension problems. Anything he sells you is worth it."