My experience is 99% autocross, so I hope people with more track experience will add their advice. But, I have worked on these cars for years, and built some pretty capable Fox Body and SN95 autocross cars. I hope this info helps...
MM makes great parts, and many people find that buying a "system" from one company is easier than piecing together parts from several companies. But, whichever path you choose, it's really important to understand what your suspension mods actually do, and how suspension adjustments impact performance. Having the best suspension in the world won't matter if it's not adjusted correctly. And, certain suspension choices are very personal, based on driving style and experience. If you don't have a lot of performance driving experience, you're better off making fewer mods, and getting more seat time. I often tell my autocross students to spend $500 on a season of autocross before they spend $5,000 modifying their cars.
You will learn more about performance driving behind the wheel of an "under-prepped" car than a car that's heavily modified. But, there are some simple mods you can make to add adjustability and composure as you start your performance driving education:
1. Chassis bracing. Do as much as you can. If you don't have access to a welder, use bolt-in bracing. But, remember, every driving input you make goes through the chassis.
2. Replace EVERY bushing. Your rubber bushing are old and most likely worn out. You can choose between rubber, poly or Delrin (in certain areas) depending on how much time your car will spend on track. I would suggest forward offset A-arm bushings (Global West Del-A-Lum bushings work well; poly are available from other sources).
3. Adjustable shocks & struts. Koni Yellows are a great option. Check out
www.alteredfox.com for a great price on them. One of the biggest mistakes people make when it comes to modding these cars for track/autocross is installing super-stiff non-adjustable shocks & struts. Adjustable shocks & struts allow you to dial out understeer and oversteer, and compensate for current and future mods.
4. Don't lower the car too much. These cars handle better when they sit higher than most people think looks cool. I use Ford Performance C springs on my Fox, with Steeda spring spacers up front and poly isolators. It sits high, but handles really well on an autocross course. A track car can be lower than an autocross car, but it shouldn't be slammed to the ground.
5. Larger rear sway bar (
Eibach 25mm). A larger rear sway bar adds oversteer, helping to dial out the understeer Ford installed from the factory. The decision to add a larger front sway bar should be made after you have established your personal preferences and the other mods you plan to make.
6. Caster/Camber plates. If you don't plan on going with coil overs, 3-bolt CC plates will work fine. Steeda or
J&M are good options. If you think you will ultimately go with coil overs, get 4-bolt CC plates.
7. Rear upper and lower control arms. There are lots of options out there; just make sure they have 3-piece poly bushings. Steeda makes an affordable kit that works well. They will help with composure and traction.
8. Spherical upper differential bushings (sometimes called bearings).
J&M makes a good, affordable set.
Those mods will help you get the car neutral and create a foundation you can build on once you've determined your driving preferences and your ultimate goals for the car. And they are relatively inexpensive, leaving you with more money to spend on seat time.
If this is going to be a track car, you will have to address the brakes. OEM Fox Body brakes aren't very good. Learning to limit braking is an important part of your performance driving education, but you want your brakes to be there when you need them. A stock Fox Body disc/drum setup isn't ideal for repetitive high-speed braking at a track event. There are four lug disc brake kits available. A good set of track pads is recommended. On an autocross car, your goal is to use the brakes as little as possible, so this is another instance where I hope people with track experience can offer advice.
I have a lot of videos on my YouTube channel that offer information on the suspension parts I use on my autocross cars. I would suggest checking out my "Budget Autocross" playlist, and my "ThoroughbRED" playlist. If you have any questions, I'm always happy to help.
Like I know what I'm talking about 
. That's what I did
