I lowered my car the first time on a set of Ksport full coilovers (threaded struts and adjustable coils, dampening adjustment as well). Lowered the car nearly three inches in the front and back. I only had to adjust front toe (tape measure and a friend way) to get it back into spec. Front camber was at 1.5° negative which is just inside allowable spec for my car so I didn't worry about it, it actually helped my cornering. Rear camber was at 1.2° which was also in tolerance.
No abnormal tire wear although the inside of the tires were worn about 1/32" more than the outside of the tires, I also kept up on rotating the tires normally. Tires were Sumitomo HTR200 with about 20 miles of autocross on them and roughly 42K miles of daily driving. They still have 4/32" of tread on the insides of the tires and 5/32" of tread on the outside of all tires. Front tires were always ran at 50psi and the rears were always ran at 48psi. I'm actually going to run them once more when spring comes around until I save up and buy more of the same tire.
Whether or not you'll need a camber kit will be up to you and your handling needs. If you want to have less camber after lowering then you will need the kit. If you're fine with still being withing alignment specs then you won't need the kit.
I have since blown the front struts and am in the process of replacing them with OEM units (struts and springs) from the 88-91 Civic/CRX generation. That way I get to stay at my lowered stance and still ride like a stock Civic VX.
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