Yes, the Koni's springcaps need modification from bolt M10 to M12. I have
posted pictures on my miata-site
(http://www.xs4all.nl/~jfeelder/miata/techniekaandr.html#schokbrekers). The
site is in dutch language but I guess by using BabelFish lot of the text
will be translated failry properly...

Jeroen
The Netherlands

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On Aug 17, 4:35 pm, Alan Baker <alangba...@telus.net> wrote:

I have the KYB AGX eight way adjustable with the FM springs. The
shocks are very nice and easy to adjust. Installation was snap. (Never
had done the job before.)

IIRC, the Koni’s require modification to the mount.

Gary

Well I have to disagree or at least add a note here as to the ease of this
job (a snap?). I would be willing to bet that Gary 'assisted' or watched
while somebody else did this operation. I'm not trying to be an a.s Gary,
maybe you're just a 'natural' but changing shocks on the Miata and that
means using a spring compressor. That tool by itself makes this job very
difficult to refer to as a snap! There are many potential issues /
difficulties any time you've got to use one of these. I've done tons of work
on my Miata's including changing shocks twice and personally, I'd rate
shocks / springs as 'not for the faint of heart' and probably best done with
an experienced assistant at least the first time. I just don't want the OP
to assume it's as easy as unbolting the old shocks and bolting the new ones
in (it is almost that easy on some vehicles).

Chris
99BBB

On Aug 17, 4:35 pm, Alan Baker <alangba...@telus.net> wrote:

I have the KYB AGX eight way adjustable with the FM springs. The
shocks are very nice and easy to adjust. Installation was snap. (Never
had done the job before.)

IIRC, the Koni’s require modification to the mount.

Gary

Did the FM Stage 1 kit. Love the AGX shocks. Springs lowered the car
nicely, but were less stiff than I would like. If I ever change them,
would talk with the techs at FM re stiffer springs.

Gary

This is precisely the set-up that I had on my '93 but I had it well
before they started packaging it as a kit.  I also had a few of the
Flyin Miata chassis braces and added the rear cross-bar that was
standard on the '94+ models (mostly to hold in a JL Stealth Box)

The Illumina's are great with 1 being a little softer than stock, 2
being about stock, then dial it down to 'pool table with the wheels
bolted on' if that is your pleasure. A little fiddling with the sway
bars and alignments and it was dialed in right were I wanted it;
mostly neutral but a slight drop of throttle would let the tail start
to rotate and it was easily held with the throttle.  I used this
set-up for around 10 years including a few thousand miles of hard
track use at Sebring Raceway.  

Swapping the swaybars takes less time to do than simply pulling out
the tools to do it. It's a breeze! I can't think of how many sets I
have done.  I did have a shop put the shocks/springs in as they had
the tools for it that I didn't.

For my '96 I did nearly the same thing (no rear perches) and went with
the KYB-AGX series instead of the Illumina's.  I regretted it from the
moment I drove away.  The wet-sponge sounds while the shocks were cold
drove me nuts and no matter th setting they never quite seemed to have
a balanced rebound/compression setting. It seemed like they were set
up for a heavier car with stiffer springs (softer compression but too
much rebound).

Be aware of one factor if you choose to do this swap: If you do not
plan to upgrade the brakes and power along the same time-lines you
might find the car looses some of the 'fun factor' that it has with
the stock suspension.  Why? It turns and sticks so bloody well that
you will forever be thinking that you are down on power. The attitude
turns serious and the playful nature is gone. Tossing the tail out on
an onramp is no longer a random act but something you have to think
about as it will take a high speed or dramatic flick of the wheel to
get it to do it. Even then it hooks right back up.  It is a great
set-up for autocross and track days, even for hard running on the
winding back roads, but the car almost becomes too serious compared to
why I bought it. For the record, I never changed away from the stock
wheels that came on my '93 B-pkg, and stayed with either the stock 185
or a +1 to 195 tires depending on the season.  I alway stayed same
front to rear.

(You may not want to read this) Lastly, if you choose to dial that
same suspension in and find yourself smiling as you rail at absolutely
rediculous speeds through situations you just don't think should be
possible, you may think you have reached the top of the handling food
chain.. I  knew it was up there, right up until I bought a Lotus Elise
with the Lotus Sport Suspension package.  After that, my beloved,
braced, sorted suspension best friend that I had for 14 years felt,
for all the world, like driving an Expedition with 4 flat tires... ;)