The Mercedes-Benz W213 E63 is a formidable machine straight from the factory, pairing a hand-built AMG 4.0L twin-turbo V8 with an all-wheel-drive system that launches it to 60 mph in well under 3.5 seconds. Yet for many owners, the stock output of 603 horsepower and 627 lb-ft of torque is merely a starting point. The aftermarket community has developed a robust ecosystem of performance upgrades — from turbo boosters and exhaust systems to ECU software tuning. Each modification comes with its own cost, installation complexity, and performance return. This article provides a detailed, real-world cost breakdown of these upgrades for the W213 E63 so you can budget effectively and avoid surprises.

We’ll examine each upgrade category in depth, including parts pricing, labor ranges, dyno-verified gains, and considerations that affect total investment. Whether you’re planning a single stage or a comprehensive build, understanding the full financial picture helps you prioritize what matters most for your driving goals.

Turbocharger Upgrades and Boost Enhancement

Increasing boost pressure or replacing the twin turbochargers themselves remains one of the highest-ROI modifications for the M177 engine. The W213 E63 already uses dual BorgWarner turbochargers, but aftermarket solutions can push them beyond their factory limits.

Plug‑and‑Play Boost Controllers and Map Sensors

For modest gains without removing turbos, aftermarket solenoid-based boost controllers or upgraded map sensors allow tuners to raise boost from the factory 20‑21 psi to around 24‑26 psi. These components are inexpensive and easy to install. Typical costs:

  • Boost controller kit (JB4, RaceChip, etc.): $400 – $700
  • Map sensor upgrade: $150 – $250
  • Installation time: 1–2 hours, usually $150 – $300

Gains from boost controllers alone are limited by the stock fuel system and turbos, usually delivering 40–60 wheel horsepower.

Full Turbocharger Replacement

For 700+ horsepower targets, the factory turbos must be replaced with larger units. Several options exist: billet wheel upgrades (using the stock housings), hybrid turbos with larger compressors, or full frame replacements from companies like Pure Turbos or Weistec. Costs:

  • Billet wheel upgrade: $1,800 – $2,800 per set
  • Hybrid turbos (e.g., Weistec Billet 60mm): $4,500 – $6,500
  • Full replacement turbos (including housings): $5,500 – $9,000
  • Labor for turbo swap: 12–18 hours, $1,500 – $3,000

Note: Labor is high because the turbos sit deep in the V‑8 valley. Removing the intake manifold and sometimes the steering rack is required. Many independent shops quote $150–$200 per hour for this work.

Dyno Results with Turbo Upgrades

Properly tuned W213 E63s with hybrid turbos can produce 700–750 wheel horsepower on 93 octane, and 800+ whp on race fuel or ethanol blends. The cost-per-horsepower here is roughly $10–$15 per horsepower when factoring in installation and supporting mods.

External link: Weistec Engineering Billet Turbos for M177

Exhaust Systems: Cat‑Backs, Downpipes, and Full Systems

Exhaust upgrades not only improve sound but also reduce backpressure, allowing the turbos to spool more freely. The W213 E63 exhaust path from the turbos out includes two catalytic converters per side, a resonator, and mufflers. Owners typically start with a cat‑back or axle‑back, then later add downpipes.

Cat‑Back Exhaust Systems

Replacing the mufflers and mid‑pipe with a freer‑flowing system is the most common entry‑level exhaust mod. Materials range from T304 stainless to titanium. Brands like Akrapovič, IPE, Eisenmann, and Remus are popular. Prices vary widely:

  • Stainless steel cat‑back: $1,500 – $2,800
  • Titanium cat‑back: $3,200 – $5,000
  • Installation labor: 2–4 hours, $250 – $600

Gains are modest (10–20 whp) because the stock exhaust is already relatively free‑flowing for a factory system. The primary benefit is weight reduction and a more aggressive note.

Downpipes (Catless vs. High‑Flow Catted)

Downpipes replace the restrictive factory catalytic converters. Catless downpipes offer the biggest power gains (20–40 whp) but require tuning to avoid check engine lights and will violate emissions laws in most states. High‑flow catted downpipes retain some catalytic conversion while still improving flow.

  • Catless downpipes: $800 – $1,200
  • High‑flow catted downpipes (e.g., Redstar, Wagner Tuning): $1,400 – $2,000
  • Installation labor for downpipes: 4–6 hours, $500 – $1,000

Caution: Catless downpipes will throw a P0420 catalyst efficiency code unless the ECU is tuned to disable the oxygen sensor monitor. Some states (California, New York) enforce visual inspections, making catted downpipes the safer street choice.

Full Exhaust Systems (Headers Back)

For the serious builder, a full system from the turbo outlets to the tips eliminates all restrictions. These systems include downpipes, a mid‑section, and rear mufflers. Prices range from $3,500 to $7,500 depending on materials and brand. Installation labor adds $800–$1,500. Total investment: $4,300 – $9,000.

External link: Akrapovič Exhaust Systems for W213 E63

ECU Software Tuning

Software tuning is the single most cost‑effective way to unlock power on the W213 E63. The M177 engine is built with forged internals and can handle significantly higher boost. Tuning adjusts fuel maps, ignition timing, boost pressure targets, air/fuel ratios, and torque management.

Stage 1 Tuning (No Hardware Changes)

Stage 1 tunes operate on a stock engine and exhaust. They raise boost to around 23–24 psi and sharpen throttle response. Most reputable tuners such as Eurocharged, RaceChip, and Cobb (through Accessport) offer OBD‑II‑based flashes.

  • Cost (mail‑order flash, cable, or handheld device): $800 – $1,500
  • Cost (dyno tuning session): $1,200 – $2,500
  • Gains: 60–90 whp and 80–100 lb‑ft torque

Stage 1 tunes run on 91–93 octane fuel. They do not require any supporting modifications. This is the highest horsepower‑per‑dollar route available.

Stage 2 Tuning (With Exhaust and Intake)

Once you’ve added downpipes, a cat‑back, and upgraded air filters or intake ducts, a Stage 2 tune can optimize for those modifications.

  • Cost (custom tune for hardware): $1,500 – $2,200
  • Cost plus remote tuning adjustments: $1,800 – $2,800
  • Gains: 100–130 whp over stock (approximately 730–760 whp on pump gas)

Ethanol / Flex‑Fuel Tuning

E85 (high ethanol content) provides significant knock resistance, allowing more boost and ignition advance. Many tuners offer a flex‑fuel sensor kit that lets the ECU automatically adjust for ethanol content.

  • Flex‑fuel sensor kit: $350 – $600
  • Installation and wiring: $200 – $400
  • Flex‑fuel tune (additional cost over Stage 2): $300 – $600
  • Gains on E85: 30–50 whp over 93 octane tune (potential 800+ whp)

Important: E85 fuel consumption increases by roughly 30%, and you need to verify your fuel system (low‑pressure pump, high‑pressure pump, injectors) can supply enough volume. Some cars require upgraded HPFP or injectors beyond 800 whp.

External link: Eurocharged Stage 2 Tuning for M177

Supporting Modifications and Ancillary Costs

Many owners underestimate the importance of supporting systems when pushing well beyond stock power. These modifications contribute to reliability and performance consistency — and they add to the total budget.

Intercooler Upgrade

Heat soak reduces power after repeated hard pulls. The W213 E63’s stock water‑to‑air intercoolers (one per turbo) can struggle with sustained boost. Upgraded units from Wagner Tuning or Do88 offer larger cores and better heat dissipation.

  • Upgraded intercooler (pair): $1,200 – $2,500
  • Installation labor: 3–5 hours, $400 – $800

Intake System

A high‑flow intake reduces restriction and can add 10–15 whp when combined with a tune. Options from Weistec, BMS, and Eventuri replace the factory airboxes with larger filters and smoother piping.

  • Carbon/CF intake system: $600 – $1,600
  • Installation: 1–2 hours, $100 – $200

Fuel System Upgrades

At the 750+ wheel horsepower level, the factory high‑pressure fuel pump (HPFP) and low‑pressure pump may not keep up. Upgrades include larger HPFP plungers, a second low‑pressure pump, or port injection kits.

  • HPFP upgrade (e.g., Nostrum Stage 2 pump): $1,200 – $1,800
  • Port injection kit (for bigger power): $1,500 – $3,000
  • Installation and programming: $500 – $1,200

Transmission and Drivetrain Support

The AMG Speedshift MCT 9‑speed can handle the extra torque, but at extreme power levels (800+ whp) it’s wise to upgrade the torque converter clutch and tune the transmission for firmer shifts. Some shops recommend a transmission fluid change with upgraded cooling.

  • Transmission tune (included in many tuning packages): $0 – $500
  • Transmission cooler upgrade: $400 – $800
  • Installation: $200 – $400

Comprehensive Cost Summary Table

Below is a consolidated table covering the most common performance modification paths for the W213 E63. Prices include parts and labor averages based on independent Mercedes specialty shops (not dealership labor rates).

Modification Package Estimated Parts Labor Total Range WHP Gain
Stage 1 ECU tune only $800 – $1,500 $0 $800 – $1,500 60–90
Cat‑back exhaust $1,500 – $3,200 $250 – $600 $1,750 – $3,800 10–20
Downpipes (catted) $1,400 – $2,000 $500 – $1,000 $1,900 – $3,000 20–35
Turbo upgrade (hybrid) $4,500 – $6,500 $1,500 – $3,000 $6,000 – $9,500 100–150
Stage 2 tune + exhaust + downpipes $3,700 – $6,200 $750 – $1,800 $4,450 – $8,000 100–130
Full build: turbos + fuel + intercooler + tune $10,500 – $17,000 $3,000 – $6,000 $13,500 – $23,000 200–250

Note: These are estimated ranges. Actual costs vary by geographic region, shop labor rate, and brand chosen. Always get multiple quotes for any installation work.

Choosing a Shop and Warranty Considerations

Installation quality is critical for a reliable build. You should find a shop that has specific experience with Mercedes‑AMG M177 engines and has a dyno on site. Many AMG dealers will void warranty claims on powertrain components that are modified. If your car is still under factory warranty, consider using a tuner that offers a piggyback device (like RaceChip or JB4) that can be removed before dealer visits, though detection is still possible.

For custom tuning, remote tuning has become popular. You log data on a datalogger, upload it, and the tuner revises the file. This allows access to top tuners without driving cross‑country. Typical remote tuning packages cost $1,200 – $1,800 and include revisions until the tune is dialed in.

External link: Bravex Motorsports – W213 E63 Upgrade Guide

Real‑World Budget Examples

To give you a better sense of total investment, here are three common build paths and their approximate all‑in costs (parts plus labor).

Build Path A: “Weekend Warrior” (Stage 2, Pump Gas)

  • ECU software tuning (Stage 2): $1,500
  • Cat‑back exhaust (stainless): $2,200
  • Catted downpipes: $1,600
  • Intercooler upgrade: $1,800
  • Labor (exhaust + intercooler): $1,200
  • Total: $8,300
  • Expected output: 680–720 whp

Build Path B: “Track Day” (Hybrid Turbos, E85)

  • Hybrid turbochargers: $5,500
  • ECU tuning (remote, flex‑fuel): $2,200
  • Full exhaust (cat‑back + downpipes): $3,000
  • Intercooler upgrade: $1,800
  • Intake system: $1,200
  • Fuel system (HPFP and flex‑fuel sensor): $2,000
  • Labor (turbos, exhaust, fuel): $4,500
  • Total: $20,200
  • Expected output: 780–830 whp

Build Path C: “All Out” (Full Race Spec)

  • Race turbos (full frame): $8,500
  • Port injection + fuel system: $3,500
  • ECU tuning (dyno): $2,500
  • Full exhaust + downpipes: $4,500
  • Intercooler + heat exchanger: $2,500
  • Carbon intake: $1,600
  • Transmission cooler + tune: $1,200
  • Labor (all hardware): $6,000
  • Total: $30,300
  • Expected output: 850–900+ whp (requires race fuel/meth)

Final Recommendations

The W213 E63 is an incredible platform that rewards careful planning. The most impactful upgrade for your dollar is without question an ECU Stage 1 tune. If you want more sound and mid‑range power, add downpipes and a cat‑back. Only consider turbo upgrades if you are chasing 750+ whp and you’re prepared to support the fuel system and heat management.

Always budget 20% more than your initial estimate for unplanned issues — gaskets, coolant lines, or sensors that may need replacement during disassembly. Work with a certified Mercedes specialist who can provide references. And remember that high horsepower demands high maintenance; shorter oil change intervals and premium fluids are part of the new normal.

With a well‑executed plan, your W213 E63 can become a four‑door supercar that outperforms vehicles costing three times as much — and doing it reliably.