modding is all about power....and power is made by adjusting the air flow to and from the engine (and adjusting the fuel to mix with all the new air). The point here is that the exhaust itself may not make gobs of hp on its own but it is part of a system of parts that when combined will make gobs of hp. We need to look at the big picture....for instance there is no point in getting cams which will let more air into the engine if you can not get that air out fast enough.....this is why 90% of import enthusiasts start with i/h/e. It's not so much the power each part makes by itself....but it's laying the groundwork for big power gains down the road. just my 2 pence
