Let me post a few comments now that I've installed everything:

First, understand that my car is a 92 with 8K miles. Plugs, coils, dist, all original and never changed from new. In other words 13 years old. Installed Tubi and stright pop and got some louds pops, typical of no back pressure. Noticed high smell of exhuast and EGA showed high HC, so I thought I try simple tune up.

There was mention by Lambo vendors the NAPA stuff would not work. Yesterday I did a car show and "ran" the car for the first time. BTW I also went to K&N with SP air intake kit.

1. Car runs incredibley well.
2. Idles so smooth you can balance a nickle on the hood
3. The "pop" on de-acceleration are all but gone, barely hear them.
4. When leaving the show, from a 30mph roll, I punched it and spun the wheels and the car went almost sideways on me (good reason for vt). I had a freind with a Ferrari behind me who can witness.

Now as for the coils:
They work very well. A bit of work to change them because not easy to remove. The air ducts in front and behind them should be removed first.

I have read in several threads that early Diablo's had a ground (UK=earth) problem due to paint on frame. When you remove the coils, there is a bracket that mounts to the frame with 2 bolts. I removed the bracket and sanded the paint off of it and off the part of the frame where it bolts on. Before installing the new coils I used dielectric cream on the areas also to prevent arcing (sp). I had a slight problem on final re-assembly fitting the forward air tube back in because it was hitting on the coil. Don't know if it was me, or the coil may have just been slightly larger. The bottom of this air tube has a hole in it to blow fresh air over the coils. I made the hole slightly larger and the air tube went back on with no problem.

Here's a pix of the intakes: