Thanks for the info! The chip/filter combo will probably come after I do the wheel/tire/suspension upgrade. I've decided on 17x8 Mercedes Replica Rims with 235-45-17 Potenza RE730's. (This is Seattle, so I've got to get a good all-season performance tire) I'm also installing Eibach progressive rate springs to lower the car about 1.5 inches. I'm wondering about the "gains" the chip promises... 15% more hp and 18% more torque? I've ordered the precision auto catalog, so I'll also see if the airbox is a substantial improvement over just adding K&N's to the stock unit. As far as the diff swap... I'm waiting to see if someone else can do it on their car first. : ) I'm quite happy with the power of this car, but hey, you can never have enough power, right? Tire quibbles aside, this is an amazing car- I just love the solidity and torque.