OK...

The "98 SPec JDM Header" will give you nice gains but the flange is 2.5 inches and the stock cat will not fit the new header, you will either have to run a test pipe or get a new cat (such as Carsound). The header will bolt right up to the motor just the same way as your stock one.

As for the Axle back, there are alot of different makes & models- the spoon does sound nice and looks rather cool. I have taken a liking to the 5Zigen cat back that my freind has on his R, simple and not too loud. I know its not that "bling" or the best...

Anyone else have thoughts?