V-Spec. Core Depending on the application and usage, some turbocharged set-ups require different flow characteristics. To add to our tuning choices, GReddy developed the V-spec. line of intercooler cores with an inner "Micro Grove Tube" design. This design was developed to allow for larger cores that give good cooling with a more free flowing internal core. This is ideal for applications with low to medium-high boost levels in factory turbocharged engines or normally aspirated engines with bolt-on turbo kits. R-Spec. Core GReddy R-Spec. cores feature a high heat-dissipating "Inner fin" design. This is ideal for medium to high boost levels on higher horsepower or upgraded turbo engines. The larger internal surface area provides superior cooling efficiency for radiating excessive heat and minimizing heat soak. Some R-spec. kits are labeled "HG" or High Grade; these kits feature piping and end tanks that have been hand-polished to a mirror finish for the ultimate in show quality aesthetics. R-Spec. Core GReddy R-Spec. cores feature a high heat-dissipating "Inner fin" design. This is ideal for medium to high boost levels on higher horsepower or upgraded turbo engines. The larger internal surface area provides superior cooling efficiency for radiating excessive heat and minimizing heat soak. Some R-spec. kits are labeled "HG" or High Grade; these kits feature piping and end tanks that have been hand-polished to a mirror finish for the ultimate in show quality aesthetics. R-Spec. Core GReddy R-Spec. cores feature a high heat-dissipating "Inner fin" design. This is ideal for medium to high boost levels on higher horsepower or upgraded turbo engines. The larger internal surface area provides superior cooling efficiency for radiating excessive heat and minimizing heat soak. Some R-spec. kits are labeled "HG" or High Grade; these kits feature piping and end tanks that have been hand-polished to a mirror finish for the ultimate in show quality aesthetics