S55 · F87 / F80 / F82

S55 Tuning Guide — F8x M2 Comp / M3 / M4

Closed-deck twin turbo I6 with massive aftermarket support and proven 700+ whp paths.

Engine Overview

Displacement
3.0L I6
Stock power
405–444 hp
Stock torque
406–443 lb-ft
Induction
Twin mono-scroll turbos
Fuel
Direct injection
Redline
7,600 rpm

Stages & Expected Gains

StageHPTorqueRequirements
Stage 1+50–70 hp+70–90 lb-ft93 octane
Stage 2+90–120 hp+110–140 lb-ftCatless DP + intake
Stage 3+200+ hp+200+ lb-ftE85 + Pure Stage 2 turbos

Recommended Mods

Stage 1
  • Stock
  • 93 octane
  • Charge pipe upgrade recommended
Stage 2
  • Catless downpipes
  • Aftermarket intake
  • Aluminum charge pipe
Stage 3
  • Flex fuel
  • Pure Turbos Stage 2
  • Front-mount IC
  • Port injection (700+ whp)

Known Issues to Watch

Rod Bearings

Refresh by 60–80k miles, especially with track use or high boost.

Charge Pipe

OEM pipe is the #1 fail point past Stage 1.

  • Rod bearings (track use)
  • Charge pipe failure

Compatible Platforms

bootmod3MHDCobb (legacy)

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