Grats!
It isn't RennTech for $1500......frig'n crazy dollars.
I don't know which but the VR530 package for $750 may go well with your choice.
VR530, as the name implies, brings Mercedes Benz 63 models to 530HP/485TQ.
The kit consists of: Underdrive pullies, HiFlow air filters, Phenolic Heat spacers and Intake temperature relocating harness.
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