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Intercooler

The OEM intercooler was decidedly too small. I went for these specifications:

MAZDA SERIES 6 RX-7 BOLT-ON INTERCOOLER
Core Dimensions: 450mm X 300mm X 85mm
Overall length of 630mm
All TIG Welded 6061 Aluminum, polished end tanks
100% Vacuum Brazed Core 
High Efficiency Bar & Plate Construction 
2.5 inch Inlet and Outlet 
Max Recommended PSI: 45psi 
Low pressure drop w/ only 0.2psi at 15psi of boost
Tested CFM: 1020 CFM

 

A huge difference and the install guide can be found here.