[KTL]

I had a 993 kit like is being discussed on my '87 narrowbody and it worked very well. I recall the caliper not being evenly centered over the rotor in my application too. Still, it worked fine. The only real issue is that the pistons end up being extended more on one side that the other. It doesn't appear to affect the operation because my car would brake fine on the track.

Also keep in mind that the caliper adapter can be flipped around to change the alignment of the caliper. Notice how the holes in the adapter are not centered/symmetric. So you may want to try flipping them over or switching them from one side of the car to the other. You might find you can improve the alignment by doing this.

If you don't need the cooling, then by all means get rid of them. The factory components of course fit perfectly and it's a simple bolt-on. Plus you can can avoid the hassle of bending some store-bought brake lines to fit the 993 calipers. Plus like you said, the 16" wheels are a tight fit- only the 16x9 930, 16x8 and 16x7 951 Fuchs, three-piece wheels like BBS, or some racing wheels like Forgeline RS and (no longer made) will fit over these big brakes. Stock brakes will allow most any wheels you can think of.