It's not necessarily 4 washers with the $15 mod. That is merely a suggestion, and I think it's more accurate to say 4-5 washers.
I did the mod and found that 4 washers was not enough. After removing all the parts again and adding an additional washer, I got the results I was looking for. I run Tokico HP struts and Eibach Pro Kit springs.
1999 Eclipse GS Built motor Hahn 16G Turbo w/ FMIC Hahn Stage 5 Portfueler (270's & 500's) Zeitronix Zt-2 wideband w/ 3.5bar MAP 3" SS Turbo Back CM Stage 4 Clutch and Fidanza Flywheel Baer Big Brake Kit