Just put on that HASS Eliminator deal. Works quite nice. Little bit more rumble from idle up till about 4-5k rpm. Idles pretty damn mean now, sounds like its got an aftermarket cam.Added areally noticable amount on top. Im happy. Probably the most performance for the money I have experienced.My friend who also has a 954(same aftermarket stuff as me, up till now) agreed on the added top end. They gave me a PC map too. The powerband is extremely smooth. Front end is off the ground through first and into second.Worth the money if you want some performance on abudget!