I am looking at buying xh series 2 xr6 for $3000 with 200,000km on the clock and was looking for some reviews on performance a reliability and if it has much potential for, I went to gentech performance to see how much for more power they offered me an extra estimated 20rwkw with extractors, intake, two hole mod and tune for 3 to 4 grand which I thought was an insane amount of money for that bit of power but not interested in turbo but maybe cam but guy at gentech said they run like s**t with cam for everyday car anyway any help would be appreciated

The guy at Gentech does not want the job or has no idea what he is doing with those motors. For $4000 you could have full exhaust system, headwork with different camshaft, different air intake a J3 chip custom tuned and you could have 40rwkw+ over stock