Has anyone installed the Borla cat back exhaust system on their Boxster S? I am about to purchase but need a little feedbach b/4 I order. DOes it indeed add horsepower? How is the sound? Does it change the running of the engine at all?

 

There is several better exhausts than Borla, like from people who actually specialize in Porsche's ie: AWE, Techart, Fabspeed...