Street Legal Performance

What Street Legal Performance does

Street Legal Performance (SLP, Inc.) is a privately held American automotive aftermarket parts manufacturer and retailer established in 1987 and headquartered in Livonia, Michigan. The company designs, manufactures, and distributes performance enhancement products for late-model American muscle cars and trucks, with catalog coverage spanning Chevrolet Camaro, Corvette, GM trucks/SUVs, Ford Mustang, Dodge Challenger/Charger/Magnum/300C, and legacy Pontiac GTO/G8 applications. Its flagship proprietary product lines are the Blackwing cold air intake systems—featuring proprietary Synteq synthetic filtration media, 3D CAD-designed housings, and CFD-validated airflow—and the LoudMouth modular cat-back exhaust systems built from mandrel-bent stainless steel with interchangeable bullet-type resonators, mufflers, and PowerFlo-X crossover pipe technology. Supporting product categories include superchargers, body kits, suspension components, brakes, drivetrain parts, wheels, interior products, and maintenance accessories.

SLP was the first company to develop a 50-state emission-legal performance package for V8 Camaros and Firebirds, a regulatory compliance differentiator the company has emphasized throughout its history. Products are engineered for bolt-on installation with no PCM re-calibration required and are claimed by the company to deliver horsepower gains of 10-20 HP depending on application. SLP holds common-law trademarks on the LoudMouth, Blackwing, FlowPac, and PowerFlo-X product brands.

The business operates a dual-channel go-to-market: direct-to-consumer e-commerce via slponline.com with phone ordering and free shipping on most items, supplemented by an authorized dealer and installer network discoverable through a public dealer search tool. The primary customer segment is American muscle car enthusiasts seeking emission-legal performance upgrades that preserve factory warranty coverage; a secondary segment includes truck and SUV owners seeking power and styling upgrades. Unit pricing spans approximately $29.99 for small maintenance accessories to $889.99 for premium exhaust systems, with credit card and PayPal accepted. Some products are reportedly experiencing up to 8-week shipping delays due to demand outpacing capacity.

Name

Street Legal Performance

Legal name

SLP, Inc.

Website

https://slponline.com

Company type

Private

Founded year

1987

Operating status

Operating

Headcount range

11–50 employees

Short description

Street Legal Performance (SLP) is a privately held automotive aftermarket manufacturer founded in 1987 and based in Livonia, Michigan. It designs Blackwing cold air intakes, LoudMouth modular exhaust systems, and performance upgrades for late-model American muscle cars and trucks, distributed through DTC e-commerce and an authorized dealer/installer network.

Ownership category

akta.pro rank

Product category

Automotive Performance Parts

NAICS

Automotive Parts and Accessories Retailers (441330)

SIC

Motor Vehicle Parts & Accessories (3714)

akta.pro primary industry

Aftermarket Performance & Tuning Products Manufacturing (Intakes/Turbos/ECU Tuners/Superchargers) (IMACANAN)

akta.pro secondary industries

Aftermarket Exterior Accessories Manufacturing (Body Kits/Grilles/Bumpers/Racks/Tow Hooks) (IMACANAI), Aftermarket Suspension & Steering Components Manufacturing (Shocks/Struts/Bushings/Tie Rods) (IMACANAC)

Keywords

• Performance exhaust systems
• Cold air intakes
• Muscle car parts
• Aftermarket auto parts
• Emission-legal performance upgrades

Headquarters

HQ city

Livonia

HQ country

United States

HQ region

North America

Offices1 record

Markets served

GTM type

B2C

Offering type

Hardware or Manufacturing

Cost components

Supply Chain, Operations, Marketing or Sales, Technology or R&D, Personnel, Infrastructure

Revenue model

1. Performance Parts Sales: SLP generates revenue through one-time sales of performance parts and accessories. Products include exhaust systems, cold air intakes, superchargers, body kits, suspension components, brakes, wheels, and accessories for American muscle cars and trucks.
2. Dealer/Installer Network: SLP distributes products through an authorized dealer and installer network. Customers can find installers through the dealer search tool on the website.

Pricing tiers

Go-to-market motion2 records

Distribution channels2 records

Marketing channels4 records

Core offering

Street Legal Performance (SLP) designs, manufactures, and sells bolt-on performance aftermarket parts for American muscle cars and trucks, including proprietary Blackwing Cold Air Intake Systems and LoudMouth Modular Cat-Back Exhaust Systems. Products are sold directly to consumers via the slponline.com e-commerce storefront and through a U.S. authorized dealer/installer network. Offerings extend to superchargers, body kits, suspension, brakes, wheels, engine/drivetrain components, and accessories for Chevrolet, Ford, Pontiac, and Dodge performance vehicles.

Product overview

Street Legal Performance (SLP) offers a comprehensive portfolio of performance enhancement products for American muscle cars and trucks. The core product lines include Blackwing Cold Air Intakes (including FlowPac packages) and LoudMouth Exhaust Systems, supported by a wide range of components such as bullet-type resonators and mufflers, body kits, superchargers, suspension, engine components, drivetrain parts, brakes, wheels, and interior accessories. SLP serves applications spanning Chevrolet Camaro, Corvette, GM trucks/SUVs, Pontiac Firebird/GTO/G8/GXP, Ford Mustang, and Dodge Challenger/Charger/Magnum/300C vehicles.

Differentiator

Problem solved

Functional benefit

Brands

• Blackwing: High-performance cold air intake system featuring washable synthetic filtration media, designed to provide up to 18 additional horsepower. The Blackwing uses Synteq filtration technology and includes a flow indicator that changes color when cleaning is required.
• Loudmouth
• Loudmouth II
• PowerFlo
• PowerFlo-X

Products and services

• Blackwing Cold Air Intake Systems High-performance cold air intake systems featuring a washable synthetic media air filter, CAD-designed airflow paths, CFD-analyzed components, integrated MAF housing, and a color-changing flow indicator. Designed for owners of late-model American muscle cars and trucks who want bolt-on horsepower gains (up to 18 HP on C5 Corvettes and up to 12 HP on Camaro/Firebird applications) and better airflow (up to 90% more than factory) without PCM re-calibration or voiding factory warranty. FlowPac packages combine multiple intake components for additional gains.
• LoudMouth Modular Cat-Back and Axle-Back Exhaust Systems Modular exhaust systems with mandrel-bent stainless steel tubing, interchangeable resonators and mufflers, and PowerFlo-X crossover pipes, allowing buyers to customize tone and performance. Provides performance gains of up to 12 horsepower. Available for Camaro, Corvette, Charger, Mustang, GM trucks/SUVs, Pontiac GTO/G8/GXP, and other muscle car applications. Pricing ranges from $449.99 to $889.99.
• Bullet-Type Stainless Steel Resonators Hand-polished stainless steel bullet-style resonators sold as individual exhaust components, available in 2.5" and 3" inlet/outlet configurations, providing wide-open exhaust flow for customizable sound and performance (priced $94.99-$189.99).
• Bullet-Type Stainless Steel Mufflers Race mufflers with ceramic-wrapped perforated cores that reduce high-frequency noise and in-car resonance; constructed of hand-polished stainless steel and sold individually (priced from $119.99).
• Supercharger Kits Performance supercharger kits for high-horsepower applications on Pontiac GTO, Pontiac G8/GXP, Corvette, Camaro, and GM trucks/SUVs, sold to enthusiast consumers seeking significant engine power upgrades.
• Body Kits Aerodynamic body modification components (ground effects, spoilers, valances) for Camaro, Corvette, Mustang, and GM truck/SUV applications.
• Suspension Components Performance suspension upgrades (springs, sway bars, dampers) for improved handling and ride quality across multiple muscle car and truck platforms.
• Engine Components Internal engine parts including performance camshafts and valve train components for various GM, Ford, and Dodge performance vehicles.
• Drivetrain Components Performance clutches, transmission upgrades, and differential components for muscle cars and trucks.
• High-Performance Brake Kits High-performance brake kits and components for improved stopping power on performance vehicles.
• Performance Wheels Performance wheels tailored for Camaro, Firebird, Pontiac G8/GXP, and Corvette applications.
• Interior Products Interior upgrades including performance gauges, trim pieces, and other cabin enhancements for various muscle car and truck models.
• SLP Car Covers Urethane-silver coated 100% polyester car covers providing weather resistance and UV protection, designed specifically for 1993-2002 Camaro/Firebird vehicles.
• Blackwing Air Filter Cleaner and Oil Kit Cleaning and oiling maintenance kit specifically designed for Blackwing synthetic media air filters, priced at $29.99.
• Authorized Installation Services (Dealer Network) Professional installation service for SLP performance products provided through an authorized installer network across the United States. Customers can locate certified installers via the dealer search tool on the SLP website.

Quantifiable outcome

• Blackwing intake systems can provide up to 18 additional horsepower on C5 Corvettes and up to 12 horsepower on Camaro/Firebird applications
• +5 more outcomes

Segments2 records

Ideal customer profiles2 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature4 records

Partnerships

One partnership is on record.

• Authorized Dealers and InstallerscoreChannel Partner/ Reseller/ DistributorSLP maintains a network of authorized dealers and installers who sell and install SLP performance products. The company provides a dealer search tool on their website to help customers locate certified installers. Dealers can become authorized through an application process on the website.

Scale indicators3 records

Recent moves5 records

Expansion highlights5 records

Direct peers

• Borla Performance Industries: Borla is a leading manufacturer of performance exhaust systems (cat-back, axle-back, headers) for muscle cars, trucks, and sport compacts. It directly competes with SLP's LoudMouth line in the same target customer (American V8 enthusiasts) and similar price points.
• MagnaFlow: MagnaFlow produces stainless-steel performance exhaust systems, catalytic converters, and intake kits across a broad range of domestic and import vehicles. It competes head-to-head with SLP on cat-back exhausts for Camaro, Mustang, Corvette, and Challenger/Charger applications.
• Flowmaster (Holley): Flowmaster is an iconic American performance exhaust brand (now part of Holley) known for chambered mufflers and aggressive sound, serving the same muscle-car and truck enthusiast segment as SLP.
• K&N Engineering: K&N is the dominant aftermarket cold-air intake and reusable air-filter brand, with its own proprietary cotton-gauze filtration media. It competes directly with SLP's Blackwing intake line and offers similar DIY-friendly bolt-on performance gains.
• Edelbrock: Edelbrock designs and manufactures performance intakes, exhausts, superchargers, and engine components for American V8 applications. It overlaps with SLP's intake, exhaust, and supercharger categories and shares the same muscle-car/GM/Ford customer base.
• Corsa Performance: Corsa specializes in stainless-steel cat-back and axle-back exhaust systems with a focus on refined, drone-reduced sound for muscle cars and trucks — competing with SLP's LoudMouth on similar vehicle applications and price tier.
• aFe Power: aFe Power manufactures cold-air intakes, exhaust systems, and filters for domestic performance and off-road vehicles. Its Momentum and Takeda intake lines compete directly with SLP's Blackwing for the same V8 enthusiast customer.
• MBRP Inc. MBRP produces aluminized and stainless performance exhaust systems for trucks and muscle cars, with strong presence in the GM/Chevy truck segment where SLP also sells exhaust and intake systems.
• BBK Performance: BBK manufactures cold-air intakes, headers, exhaust, and throttle bodies specifically for late-model Mustangs, Camaros, and other American muscle cars — a tight product-overlap and customer-overlap match for SLP.

Broad incumbents

• Holley Performance Products: Holley is a large, diversified performance-parts conglomerate owning multiple brands (Flowmaster, MSD, ACCEL, DiabloSport, etc.) spanning fuel systems, ignition, exhaust, and tuning. SLP competes with several of Holley's portfolio brands but at a much smaller scale and without Holley's tuning-electronics breadth.

Market position

Strengths4 records

Weaknesses4 records

Competitive moat4 records

Key risks6 records

Key highlights6 records

Customer concentration

• Xx.com/slp_performance
• YouTubeyoutube.com/user/SLPOnLine
• Facebookfacebook.com/slpperformance

Revenue estimate

Valuation estimate

Number of profiles

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Street Legal Performance