When the decision is made to begin modifying that fancy new (or older) car you just bought, there’s a logical progression. The first and easiest way to get more power and a more aggressive sound from your vehicle is by freeing up the restrictive factory intake and exhaust systems by installing high-flowing aftermarket pieces. Easy breathing is the best way to make power, regardless of how modest or intense your intentions are, so why not start with one of the many featured products in this guide to uncork extra horsepower from your ride?
A Spec Products
EVO VIII & IX cat delete
By replacing the restrictive factory catalytic converter with a titanium cat-delete pipe from A Spec Products, it’s possible to create a fully free-flowing exhaust system for your EVO VIII or IX. Make sure to check your local laws regarding emissions equipment because these pipes may not be legal for street use in your state.
A Spec Products
Universal L-Spec muffler
A Spec Products’ universal L-Spec muffler features a 3-inch inlet and an 8.5-inch extra-long tip. These free-flowing mufflers will aid in clearance if your car has an aggressive rear aero kit, as well as increase performance when compared to restrictive factory muffler specifications.
Universal stainless muffler
Universal high-performance mufflers from BLOX Racing are fully polished and feature a single 102mm tip. Each muffler comes with a bolt-in silencer that doesn’t restrict exhaust flow. This is a great choice for those looking to replace their existing stock or aftermarket unit, or for those who don’t have an exhaust application readily available.
Aluminum velocity stacks
BLOX Racing velocity stacks incorporate race-proven intake technology into a product designed for daily driven vehicles. These velocity stacks are designed to optimize and maximize airflow rates entering the induction system and are ideal for naturally aspirated and turbocharged applications. They’re available in 2.5-, 3- and 4-inch sizes and are made out of composite nylon or anodized billet aluminum.
Legalis R exhaust system
The Legalis R model is perfect for the street because of its oval-type canister and provides an increase in power throughout the rpm range. The RM-01A is great for an enthusiast looking for increased horsepower and weight reduction while maintaining good throttle response, and the Super Ti model provides the most power gain and greatest weight reduction. All Fujitsubo exhaust systems are made in Japan using the latest technology and highest quality materials.
Lexus IS-F intake system
This new system draws air through a K&N high-flow air filter that increases airflow and never needs to be replaced. Protecting the titanium-top, cone-shaped air filter and isolating it from engine heat is a powdercoated heat shield that replaces the stock airbox.
Electronic valve-controlled exhaust
The Agency Power GT-R exhaust gives the user the ability to control the performance and sound of the exhaust with the push of a button. Valves mounted near the muffler allow exhaust gases to either pass straight through for performance and a louder sound, or be diverted into the muffler for a quieter sound.
Honda Civic Si MegaPower RR exhaust
Based off of the same systems Skunk2 designs for its championship-winning race cars, the 76mm MegaPower RR exhaust for the ’06–11 Civic Si was designed for turbocharged engines, as well as for heavily modified NA applications that require significant exhaust flow. Dyno-proven for maximum horsepower, MegaPower RR systems are constructed of T-304 stainless steel, are robotically TIG-welded and feature CNC mandrel bends for precise fitment.
R35 GT-R Alpha induction kit
AMS has eliminated driveability issues often seen when running high horsepower on the R35 Nissan GT-R by converting the stock induction system to a blow-through MAF system. This conversion provides improved measurement of airflow entering the engine and allows you to run an atmospheric vent blow-off valve without the throttle issues that commonly arise on the standard draw-through MAF system. This system has been proven effective up to 1,400 hp.
Titanium exhaust systems
With a long history of high-end motorsports engineering, Akrapovic has recently released a number of offerings for the sport compact segment. These exhausts are exceptionally well made, featuring full titanium construction front to back. This system can save up to 38 lbs when compared to stock, and applications include the Nissan GT-R, 370Z, and Mitsubishi EVO X with more coming soon.
Honda B- & K-series headers
These 4-2-1 headers are constructed out of 16-gauge, T304 stainless steel and feature equal-length, mandrel-bent tubing. The CNC-machined flanges and piping are TIG-welded for additional strength and reliability.
Hyundai Genesis Coupe exhaust system
All MXP exhaust systems are thoroughly dyno-tested and proven to provide the most power throughout the entire powerband. Each Genesis Coupe exhaust features a quad-tip design with a burnt-titanium finish and is constructed of SUS304 stainless steel for maximum corrosion resistance and weight savings. All MXP performance products come with a three-year limited warranty from the original date of purchase.
T-Titan sports muffler
This exhaust system is designed specifically for styling, performance, power and sound. M7 designers carefully selected piping bends and diameters to provide excellent exhaust note for daily commutes and deep, throaty tone under full accelerations and competition use. The T-Titan is JASMA-approved and comes with adjustable tip and removable silencer.
R35 GT-R Y-pipe
MXP has released a replacement Y-pipe for the restrictive OEM unit on the R35 GT-R. The twin section utilizes 76mm inner diameter piping, which leads to an 89mm primary to provide optimal exhaust flow enabling quicker turbo spool and more horsepower. This Y-pipe is a direct bolt-on unit, requiring no modifications, and is constructed of the highest quality SUS304 stainless steel for maximum durability and corrosion resistance.
A Spec Products
Universal air filters
These universal replacement air filters can help unlock a few extra ponies from your factory intake box (on certain models) and can also be used for custom air induction systems.
CR-Z cold-air intake
Specifically designed to boost power and acceleration, this new cold-air system uses a mandrel-bent aluminum intake tube engineered to reduce restriction and intake temperature. The intake tube is routed to the outside of the engine bay to deliver air with lower temperatures to the air inlet, which helps achieve increased horsepower because of the cooler outside air.
WRX STI carbon-fiber cold-air intake
Handmade in-house, the beautiful new Agency Power carbon-fiber cold-air intake kit is available in several colored CF weaves. The kit gained approximately 10 hp and 10 ft-lbs of torque, and at the peak horsepower point of 5000 rpm, the intake kit made almost 20 whp.
Hyundai Genesis Coupe test pipe
Mackin Xtreme Products has designed a test pipe to replace the restrictive cat on the Genesis Coupe 2.0T. With a 77mm inner piping diameter, this test pipe will free up exhaust flow exponentially to provide maximum top-end gains. Constructed of SUS304 stainless steel, you can rest assured that this will provide maximum durability and corrosion resistance.
Subaru WRX STI exhaust manifold
Available in equal-length and non-equal-length applications, the MXP EJ25 exhaust manifolds offer a higher volume of exhaust flow to ensure quicker turbo spool up and increased top-end performance. These units are constructed of the highest quality SUS304 stainless steel for maximum durability and corrosion resistance.
Stainless steel headers
Megan Racing stainless steel headers are made of thick T-304 stainless steel and are mandrel-bent to form and fit to your particular application with the best performance results possible. These headers help your engine maximize its performance by allowing the exhaust gases to flow more efficiently to gain power and performance.
Stainless steel after-cat exhaust system
These SUS-304 stainless steel exhausts feature CNC-machined flanges and mandrel bends. Its aggressive styling and deep, strong tone are just part of the Megan Racing after-cat characteristics. It also serves to improve horsepower, torque and overall performance with its straight-through design.
NISMO R-Tune 350Z headers
NISMO R-Tune headers are truly a work of performance art. Equal-length, mandrel-bent T-304 stainless steel headers are designed, tuned, dyno-tested and handcrafted to optimize your engine’s performance. Smooth mandrel bends and merged cone collectors reduce backpressure for increased horsepower throughout your engine’s operating range.
Honda K-series Pro Series intake manifold
This intake manifold features a larger plenum and shorter, oversized runners when compared to Honda’s original unit and is cast with thicker wall material, leaving room for further porting. Designed for street enthusiasts who want more power but don’t want to sacrifice midrange performance to get it, the results are improved airflow, an enhanced venturi effect and both midrange and top-end power gains.
Concept G Blue after-cat exhaust
Take your turbo car to the next level with a full turbo-back or after-cat exhaust system. This SUS304 stainless steel system features 1.5mm and 1.2mm wall piping, mandrel-bent piping and inconel-treated tips for the best combination of rugged heat resistance and weight reduction and finish. Concept G Blue is for off-road use only and not rated under 93dB.
Medallion Touring after-cat exhaust
This 100 percent SUS304 stainless steel system uses Advantex packing material to bring you a mature-sounding and tastefully built exhaust for your highly tuned machine. Rated at 93dB, this exhaust provides a powerful yet subtle tone and offers high ground clearance at the same time.
Acura TSX cold-air intake
The DC Sports two-piece cold-air intake can convert to a short ram system, and all DC intakes are TIG-welded by hand and polished to get a show-quality finish.
Honda Civic Si MegaPower header
Skunk2’s MegaPower header for the ’06–11 Civic Si is engineered to maximize exhaust flow and increase horsepower and torque throughout the powerband. Each fully polished MegaPower header is made from T-304 stainless steel and features equal-length, sequentially paired, stepped primaries and a 4-2-1 tri-Y design that terminates into a 2.5-inch collector.
Honda B18C exhaust manifold
In order to get the best performance, engine power and efficiency, this exclusive exhaust manifold design takes into consideration not only the special characteristics of the Honda B18C engine but also the results of an extensive dyno testing program. Constructed entirely from stainless steel for long-term durability, TODA exhaust manifolds are handbuilt by experienced craftsmen at the TODA factory.
Honda S2000 exhaust system
During the course of development, TODA tested various pipe diameters, muffler designs and bends until the final design was conceived. Maximum power output through out the entire rpm range was the main design criteria for these high-power exhaust systems. Constructed from high-quality stainless steel, the system is improved performance by increasing power and reducing vehicle weight.
Honda S2000 exhaust manifold
The TODA S2000 exhaust manifold is meticulously handmade in Japan by experienced craftsmen using high-grade stainless steel for its durability and light weight. Leveraging its more than 40 years of experience in tuning high-output 4-cylinder Honda racing engines, TODA S2000 exhaust manifolds extract the maximum available performance from F20C and F22C engines.
Mandrel-bent exhaust systems
TruBendz has been in business since the mid-’90s making exhaust systems, and with its growing line of products, the company can supply you a quality bolt-on system or a tubing kit at an affordable price. Make your dream exhaust system become a reality.
Honda K-series Pro Series throttle bodies
Skunk2 is proud to offer the only big-bore, billet throttle body for the ’06–11 Civic Si. Manufactured from 6061-T6 aluminum and hard-anodized for durability in Skunk2’s signature finish, Pro Series throttle bodies are designed for use with OEM or Pro Series intake manifolds for bolt-on horsepower gains by optimizing engine airflow.
Titanium test pipe
Akrapovic offers an optional full titanium test pipe for its top-of-the-line EVO X exhaust system. For the best of the best, the Akrapovic systems simply cannot be beat, providing excellent power gains while still maintaining a quiet and tame exhaust note, even with the test pipe installed.
Modern Automotive Performance
EVO X short ram intake
3.5-inch short ram intakes from Modern Automotive Performance feature all-aluminum construction and include a heat shield for increased performance.