Gravedigger 07-13 Mazdaspeed 3 Under Route Intercooler Piping Kit

CURRENTLY IN PRE-ORDER ESTIMATED SHIP DATE JUNE 1, 2026, EARLY CANCELLATIONS ARE SUBJECT TO CANCELLATION FEES

Key Features

• Under route hot side routing for a cleaner engine bay, shorter path, and lower IATs!
• All aluminum piping to avoid expansion/collapse issues seen with all silicone kits.
• Compatible with 2.5” or 3.0” inlet/outlet FMIC cores
• Two options available:
  • Hot Side Only (use with existing FMIC cold-side piping kits)
  • Full Kit (includes cold side from FMIC outlet to throttle body)
• Stock style BPV flange (fits GoFastBits, Turbosmart, etc.; HKS/Tial via adapter)
• Lifetime warranty against manufacturer defects

Fitment

• 2007 - 2009 Gen 1 Mazdaspeed 3 (BK)
• 2010 - 2013 Gen 2 Mazdaspeed 3 (BL)
• Does not fit Mazdaspeed 6 (transfer case prevents required turbo rotation)

Turbo / Compatibility Notes

• Confirmed compatible: BNR S3 - S5 turbochargers / CST4 - 6
• Not confirmed: Garrett / ATP (fitment not yet verified)

Intercooler Compatibility

• Mishimoto M-Line
• Mishimoto R-Line
• Treadstone TR8
• Treadstone TR1035 / TR1045

What’s Included

Hot Side Only (Under Route)

• 2-piece hot-side intercooler piping
• 4-ply couplers
• T-bolt clamps

Full Kit (Hot Side + Cold Side)

• Everything in Hot Side Only, plus:
• 1-piece cold-side piping (FMIC outlet to throttle body)
• 4-ply couplers
• T-bolt clamps

• BNR Rotated Turbo Bracket (sold separately)

Specs

• Diameter: 2.5”
• Material: Aluminum piping (silicone couplers)
• Finish: Polished aluminum
• Powder coat: Available by email quote
• BPV/BOV flange: Stock-style flange (GFB/Turbosmart compatible; HKS/Tial via adapter)

Installation Notes

• Install time: ~2-3 hours
• Difficulty: 4/5 (turbo clocking required)
• Minor trimming: slight fog light trimming required (passenger side)