on the4g cars yoou have to watch the outer edge of the UCA. it tends to find the inner fender, and the upper frame rail easily. the problem is the size of the upper ball joint. if honda had used a smaller joint, they could have slid it out further, or given you room to install a ingalls type pivot kit.
personally, I hate the ingalls kits. they are poorly designed, and poorly constructed. thier adjustment is very coarse, and difficult to maintain. hard driving can and will make the adjusters slip, and this leads to camber AND caster issues, making the car very unstable.
the adjustable ball joints might be cool, but since they are so tall, they will bind up in the inner fender before you really get low enough to need them.
one company makes a $500 set of uppers with a sliding ball joint (looks like a toyota pickup upper bj), but in the pics it doesn't look like they come any futher out really than the stock ball joint sits. and, since there is still a clearance issue at the rail, i'm not sure these will adaquately clear a stock car.
this summer I should have some adjustable uppers available for the 4g cars, I'll let everyone know as soon as testing is complete.