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

Clean up the engine bay and shorten your charge path with the Gravedigger Under-Route Intercooler Piping Kit for the 2007–2013 Mazdaspeed 3. Built from 2.5” aluminum piping (not silicone), this kit routes the hot side under the engine and supports 2.5” or 3.0” inlet/outlet intercoolers including popular Mishimoto and Treadstone cores.

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

Designed for front-mount intercooler setups using 2.5” or 3.0” inlet/outlet sizing.
Compatible examples include but not limited to:

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

Optional Add-On

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)

1st Gen Mazdaspeed 3 Parts

Gravedigger 07-13 Mazdaspeed 3 Under Route Intercooler Piping Kit