I put 7.5k miles on my bike in the last year, it is used everyday if the weather permits. Oil changes, plugs, tires coolant, and air filter cleaning are expected maintenace.I've had cracked FMU shims, leaky throttlebody boots, cracked header, dry rotted fuel lines, another cracked header ,and cracks in the wastegate hose (boost spiked to 28psi) all in a years time. If you drag race, save up for an undercut tranny, shift forks, output shaft, and shift shafts. Stay away from Hahns kit even if its on sale.Extra money for a stage 2 will save you from the FMU headache.I've had built 2 gsxr 1100s,3 zx9s, 1 gsxr 750, and a built 83 gs 750. The main things that matter to me is that the bike cranks everytime and I don't have to call for a truck to pick me up. I love the boost but it adds more variables. More power will always find the weakest link in the drivetrain.