Which front mount intercooler is better for a Mazda RX-7 FD, Blitz or GReddy?

Based on the available technical information, the Blitz front mount intercooler (FMIC) is highly preferred over the GReddy for the FD RX-7.

Here is a breakdown of how the two compare:

Blitz Front Mount

• Fitment: The Blitz (along with Apex'i) FMICs are designed to sit slightly further back. This allows you to install the intercooler without having to hack up your front bumper or cut the stock rebar ⁴.
• Cooling: Because it is set further back, it allows significantly more air to pass through to the radiator, preventing the cooling issues common with other front mounts ¹.
• Drawbacks: Since these are older kits, they can be difficult to track down used. If you do find one, make sure it includes all the mounting brackets, as fabricating missing brackets can be a chore ⁴.

GReddy Front Mount

• Fitment: The original GReddy front mounts were stylized to sit as far forward as possible so the intercooler was highly visible. Because of this, they force you to heavily cut the front bumper and the stock rebar to make them fit ⁴.
• Cooling: Positioning the large core tightly against the front heavily blocks incoming air from reaching the radiator, making heat management more difficult ¹.

An Alternative: The GReddy V-Mount If you want GReddy quality but want to avoid the drawbacks of their front mount, the GReddy V-Mount Kit is an excellent, well-documented option. It does not require hacking up the car, and it angles the intercooler and radiator so they do not overlap ⁴. This V-orientation allows both cores to receive direct cold air from the grille, simultaneously allowing for increased boost and decreased heat ³.