Description

STM Evo X Stainless Engine Bay Bolt Kit (Master Set)

Firstly, Buy STM Evo X Stainless Engine Bay Bolt Kit Master Set online. The STM Evo X Stainless Engine Bay Bolt Kit Master Set is a complete engine-bay hardware upgrade designed for the 2008–2015 Mitsubishi Lancer Evolution X. This master kit combines five STM stainless-steel hardware kits into one comprehensive package, providing 186 bolts, washers, and nuts to replace old, faded, or rusted factory engine-bay hardware. It is an excellent choice for Evo X owners who want a cleaner, more organized, and refreshed engine-bay appearance without replacing individual fasteners one kit at a time.

Manufactured by STM Tuned, this aftermarket hardware kit focuses on both appearance and practical replacement of aging engine-bay fasteners. The stainless-steel hardware provides a clean finish while helping refresh areas that commonly show corrosion, discoloration, or wear over years of use. STM specifically designed the master set around the Evo X engine bay, making it a convenient option for maintenance, restoration, detailing, and engine-bay dress-up projects.

STM Evo X Stainless Engine Bay Bolt Kit Master Set

The STM master set brings together several individual Evo X hardware kits into one package. Instead of purchasing the valve cover, headlight and fender, ECU, intake manifold, and power steering kits separately, the master set provides all five together.

STM lists the master kit as containing 186 total bolts, washers, and nuts. This makes it one of the more comprehensive hardware refresh options available for the Evolution X engine bay.

The kit includes:

• STM Valve Cover Bolt Kit
• STM Headlight & Fender Bolt Kit
• STM ECU Bolt Kit
• STM Intake Manifold Bolt Kit
• STM Power Steering Bolt Kit

These individual kits cover different areas of the engine bay, allowing owners to replace a large amount of visible hardware with matching stainless-steel components.

Stainless-Steel Hardware for a Cleaner Engine Bay

Firstly, the kit replaces many of the original fasteners with stainless-steel hardware. Factory bolts can become faded, oxidized, scratched, or rusty over time, particularly in an engine compartment exposed to heat, moisture, road salt, and repeated servicing.

Replacing those fasteners can make a noticeable difference when cleaning up an Evo X engine bay. Stainless hardware also provides a consistent appearance across multiple mounting locations.

This makes the kit particularly useful for owners preparing an engine bay for a show, restoration, photography, detailing, or simply a cleaner daily-driver presentation.

Complete Master Set for the Evo X

Secondly, the STM Evo X Stainless Engine Bay Bolt Kit Master Set is designed as a consolidated package. STM states that the master set combines the five individual bolt kits and saves $10 compared with purchasing those sets separately.

Rather than identifying every individual fastener required for different areas of the engine bay, the master set provides a coordinated hardware solution.

This can be especially useful during an engine rebuild or engine-bay refresh, when many original fasteners may already be removed and being replaced.

Designed for 2008–2015 Mitsubishi Evolution X

Thirdly, STM lists this master set for the 2008–2015 Mitsubishi Lancer Evolution X. The individual components are also specifically cataloged for the Evolution X platform.

The kit is intended for the Evo X engine bay and associated exterior mounting areas covered by the included sub-kits. Always compare the hardware being removed with the replacement hardware before installation, especially if the vehicle has previously been modified or has non-factory components.

What Is Included?

The master set contains the following STM hardware packages:

Valve Cover Bolt Kit

The valve cover kit is designed to replace factory hardware around the Evo X valve cover. STM describes this kit as including properly shouldered bolts for the valve cover along with replacement Allen-cap M6 socket bolts for the ignition coils and harness. It is designed to work with both metal and plastic valve covers.

Headlight and Fender Bolt Kit

The headlight and fender kit provides stainless replacement hardware for the original faded fasteners in these areas. STM lists ten M6 x 12 mm stainless Allen bolts and ten M6 stainless fender washers in this individual kit.

ECU Bolt Kit

The ECU kit covers much of the right side of the engine bay, including the fuse-box battery cable junction, ECU brackets, grounds, and solenoids. STM’s individual kit uses multiple M6 and M8 stainless socket bolts, nuts, flat washers, and fender washers.

Intake Manifold Bolt Kit

The intake manifold kit replaces hardware around the intake manifold, fuel rail, and MAP sensor. STM lists M5, M6, and M8 stainless hardware in this package, including bolts, a nut, and flat washers.

Power Steering Bolt Kit

The power steering kit covers the left side of the engine bay around the power-steering reservoir and lines. STM describes this as an easy upgrade for replacing old or rusted factory hardware.

STM-EVOX-SBK-MASTER Specifications

• Brand: STM Tuned
• Product: Stainless Engine Bay Bolt Kit
• Kit Type: Master Set
• SKU: STM-EVOX-SBK-MASTER
• Material: Stainless steel
• Total Hardware: 186 bolts, washers, and nuts
• Vehicle: Mitsubishi Lancer Evolution X
• Model Years: 2008–2015
• Engine Platform: 4B11T
• Application: Evo X engine bay and covered mounting areas
• Product Type: Aftermarket engine-bay hardware and dress-up kit
• Individual Kits Included: 5

STM currently lists the master set as a dedicated Evo X engine-dress-up product.

Benefits of the STM Master Bolt Kit

Replacing old engine-bay hardware can provide several advantages:

• Refreshes faded or corroded fasteners
• Creates a more consistent engine-bay appearance
• Uses stainless-steel replacement hardware
• Covers multiple engine-bay locations
• Includes 186 pieces
• Combines five STM hardware kits
• Convenient for restoration projects
• Useful during engine builds and maintenance
• Helps eliminate mismatched or damaged visible hardware
• Ideal for Evo X engine-bay detailing
• Designed specifically around the 2008–2015 Evo X platform

For enthusiasts who pay attention to the small details, replacing worn hardware can make an engine bay look significantly more complete.

Ideal for Evo X Engine Bay Restoration

The STM master kit is especially useful during an engine rebuild or comprehensive engine-bay cleanup. When components are removed, it is often easier to identify fasteners that are rusty, damaged, or no longer visually consistent.

Installing fresh stainless hardware can complement other Evo X engine-bay upgrades such as a valve-cover plate, upgraded fluid caps, catch cans, intercooler piping, reservoirs, or other dress-up components.

Because this is a hardware and appearance upgrade rather than an engine-performance component, it can be installed independently of modifications to the 4B11T engine.

Installation Considerations

Before installation, organize the hardware by location and compare each replacement fastener with the original component. Do not assume that every bolt in the kit is intended for every engine-bay location.

Use the correct fastener for each application and follow the vehicle manufacturer’s torque specifications where applicable. Stainless hardware should not automatically be torqued to the same specification as every original fastener without considering the specific bolt size, application, and material.

If you are working on a modified Evo X, verify clearance and thread engagement before installation. Previous aftermarket modifications may change the hardware requirements in certain locations.

Buy STM Evo X Stainless Engine Bay Bolt Kit Master Set

If you’re looking to buy the STM Evo X Stainless Engine Bay Bolt Kit Master Set, this comprehensive 186-piece hardware package is an excellent way to refresh the appearance of your 2008–2015 Mitsubishi Lancer Evolution X engine bay. With the valve cover, headlight and fender, ECU, intake manifold, and power steering bolt kits combined into one package, the STM master set provides a convenient solution for Evo X owners who want cleaner, newer-looking engine-bay hardware.

Frequently Asked Questions

Is this an OEM Mitsubishi bolt kit?

No. The STM Evo X Stainless Engine Bay Bolt Kit is an aftermarket STM Tuned hardware and engine-bay dress-up kit. It is not a genuine Mitsubishi OEM hardware package.

How many pieces are included?

The master set includes 186 bolts, washers, and nuts.

What Evo X years does the kit fit?

STM lists the kit for 2008–2015 Mitsubishi Lancer Evolution X models.

What individual kits are included?

The master set includes the valve cover, headlight and fender, ECU, intake manifold, and power steering bolt kits.

Is the kit made from stainless steel?

Yes. STM describes the master set as stainless-steel replacement hardware designed to replace old, rusted, or faded engine-bay hardware.

Does this kit increase engine performance?

No. This is primarily an engine-bay hardware and appearance upgrade. It does not increase 4B11T horsepower or torque.

Can I buy the individual kits instead?

Yes. STM also sells the valve cover, ECU, headlight and fender, intake manifold, and power steering kits separately. The master set combines them into one package and is listed as saving $10 compared with buying the individual kits separately. The STM Evo X Stainless Engine Bay Bolt Kit Master Set is a comprehensive 186-piece stainless-steel hardware upgrade for refreshing the engine bay of a 2008–2015 Mitsubishi Lancer Evolution X, so shop and order your STM Evo X hardware kit and other Mitsubishi Evo parts from evomotorparts.com today.