What are these 260 and 280 hp files? For 280 hp with stock car you have to be carefull for 2 reasons. For pick 280hp with a chip that is produced for all cars and not specially to each one, you have to increase boost. High boost with stock ignition system in Integrale evo1 with distributor may spikes at high rpm. The safe way to peak 280hp to a stock engine like ours is a nice exhaust system (decat in my opinion) a free air filter fitted in a place that will receive fresh and cold air and a good fmi. Using high octane gas 100ron preferred you can make a good chip programming with normal boost and higher spark advance. Then you can have safelly 280 hp otherwise these are risky numbers