well my horsepower estimates were wishful thinking i geuss.i probably could install the stuff myself but i just get worried when it comes to the engine. are there some bolts underneath the car that have to do with the removal and installation of the new headers? i couldnt get to those if i wanted too. plus i have no clue how to install the catback exhaust and catalytic converter...im sure its not too dificult but i dont be able to get underneath the car to remove and install the components