Ok my performance place reckons that with a unichip i will get an increase of 15 hp at the wheels. It's a 2.0L 16V with minor engine mods - K&N, 2" zorst from da cat back, NGK platinum plugs and runnind 98 RON. Any one had any experience with these? Does this sound like the right power gain? If so will I be able to notice it? Gonna cost me about the equivalent of 350 pounds.