There isn't really a cheap or expensive way. WEll there is it is called a Big Bore Kit but that is expensive. Pipes help on top and mid. A Torque single pipe may be good. Keeps plenty of back pressure for good torque but doesn't do much else through the power band. Clutch kit will just make better use of the power prolly won't help a lot though I would recomend installing one anyway. BUt if you pipe/remain stock there are different kits. Higher compression heads may help a bit. See the problem with aftermarkets is they never ever talk in Torque. Torque is freaking important but they only ever mention HorsePower never torque gains. The only thing I have ever seen was a D&D single pipe for the ZR 600 that says it is a Torque pipe but doesn't say how much you gain.
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