Dude, Coastal sucks. How can you recommend that stuff. That's like Super Tech from Wal-Mart. The OP was asking about the best lol.
Just get some Redline and be done with it.
Oldsinner, are you truly running 20 psi boost in your frankenbenz? 13 psi MAX with an OM617. Poor car lol

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'02 BMW 325i
'85 300D 450k
'93 190E 2.6 170k(killed by tree)
'08 Ducati Hypermotard 1100S 6k
'06 Ducati S2R800 14k(sold)