Ya, I had my torque boxes welded up when I put subframe connectors in. Just don't use an arc welder... the metal is pretty thin...
The stock 4 link sucks. It's all compromise... using them to control lateral movement causes all kinds of bind.
The uppers do provide awesome anti-squat on these front heavy, RWD cars... but they cause bind, and aweful rear brake jacking.
For the strip, keep them. If you wanna turn corners, think about removing them, and go with a panhard bar & torque arm (or parallel 4 link). This lowers the rear roll center, so the front end isn't always overloaded (reducing the understeer). It also requires stiffer rear springs... so you can also go a little lower, without bottoming out all the time.
That'll probably blow the budget, so for starters, get some good lowers. Spherical bushings on one end will really reduce bind. The global west arms are decent, if that's all you'll ever do... but they won't work with a PHB, so keep that in mind.
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