camshafts wear at a rapid rate on cvh engines. i dont think they have any major problems reliability wise, except the fuelling is critical and as such many a melted piston occures. despite its limitations the fuelling system is better than people often say. the fact that its 20 years old means it can go out of sync and run the motor lean. mfi engines can be good for 200hp if the fuel systems in good nick and has been setup correctly. any time you alter the settings ie boost upward you must have the fuelling checked. the fact the turbo is a garret or should be, the engine oil is changed regular with top notch synthetic and correct fuel is used ie bp ultimate, v power or super unleaded then the motor is pretty good. be sure to use genuine parts/gaskets and be on the lookout for rust. other than that there great fun and potentiolly rapid cars. my base model, turboed gives many a chav a raised eyebrow in his slow but noisy halford mobile. 130hp, 130 mph and 0-60 sub 8s aint bad. add 70hp and things are real fun,quick without been un drivable. 200hp with fwd is plenty.