The Celica wasn't low enough or stiff enough for me with the springs and shocks I originally installed. So I decided to install some adjustable coil-overs.
Additional goals were I wanted to keep camber at -1.5 or less and I didn't want to use crash bolts.
My only concern about installing these coilovers was the lack of rear camber plates. Camber plates could have been included on the back and I considered trying to adapt some but it turned out not to be necessary.
 Well-packaged coil-overs from Megan Racing
Well-packaged coil-overs from Megan Racing
I installed these coilovers without adjusting the ride height, and the ride height was exactly what I wanted.
 Opened box
Opened box
In the front, with the camber plates, camber adjustment was not an issue. The rear was a different story. Initial camber with the Eibach springs was -1.6° so some correction was obviously going to be needed. With the coilovers the ride height was lower and the camber was -2.7°. By slotting the strut tops about half an inch as shown the camber was -2.1°. I decided to slot the bottom hub bolt hole of the coilover. I used tab washers from Moog crash bolts. The tab thickness on these bolts was 1/8" thick, so I slotted the holes 1/8" and used these washers to ensure the bolts would stay at the end of the slots. Not really necessary but why not? With the bottom slot, camber came to -1.4°.
 Slotted rear holes in chassis
Slotted rear holes in chassis
Due to slotting the holes and moving the strut tops outward, I had to lengthen my rear strut brace slightly.
 Slotted rear holes in coil-overs
Slotted rear holes in coil-overs
After installation I checked the corner weights and decided that no adjustment of corner weights was needed.
 Car on scales
Car on scales
 Corner weights total 2543 pounds including me and half a tank of fuel.
Corner weights total 2543 pounds including me and half a tank of fuel.
Wheel arch heights with Eibach Prokit: 25.5" front 25.25" rear
        Wheel arch heights with Megan coilovers: 24.25" front and rear
 Here's the ride height you get with the factory adjustment of the Megans.
Here's the ride height you get with the factory adjustment of the Megans.
Weight of stock springs/struts: 19 lb per corner
        Weight of coilovers: 12 lb each
        Weight savings: 28 lb, most of which is unsprung
Note: lowering the front produced quite a bit of toe-out which had to be adjusted.