I notice the posts on this topic are a little old but I thought I'd add my 2 cents about my recent Hyperground install.
Purchased the kit and performed an install on my 2003 GT because I've been having heavy duty come and go flickering light (interior and exterior) issues. Install wasn't too bad. I followed Sun's recommendations, from negative battery terminal, one cable to driver's side fender ground, one cable from negative terminal to cylinder head, at cylinder head two cables - one to transmission ground and the other to the intake manifold and finally the last cable from the intake manifold to one of the black strut bolts on the passenger side.
Lights still flicker and flicker plenty, no rhyme or reason to when or where they will flicker. I will admit that the car does seem to have a smoother possibly more powerful run up to the redline when stomping on the accelerator.
If anyone has any opinions on my "following Sun's install directions" I'd love to hear them. And any advice on my light flickering problem would also be appreciated. This is really a great car expect for this electrical issue.
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