I run greedy s on blue car and greddy r on yellow car. they work great. they do not leak. dont know how these incorrect rumors get started. I have tested them both under boost on the dyno with mechanics glove on the outlet.
never used HKS but it looks like it doesnt flow much. less than s/rs and way less than r. flow is very important to relieving pressure fast enough so turbo thrust doesnt feel it.
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want a piece of the yellow car? (buy it)
you have to beat the blue car first
and then you have to take on the IV
my favorite quote
"if the solution is simple, God is answering"