The MACH Force ST Exhaust Tuning Inserts are exclusive to aFe and use a patent-pending technology. Using a "Reflection chamber design", you can modify the sound and tone of your MACH-Force ST and Takeda ST exhaust systems. By slipping the ST Exhaust Tuning Inserts between your exhaust's V-band flanges, you can control the amount of airflow that bypasses the muffler. This change in airflow will also change the tone of your exhaust system, ranging from mellow to aggressively loud. Use a smaller diameter ST Core to lower the engine tone so you don't wake up the neighbors.

When out in the streets or track, remove the ST sound core for a full exhaust flow and full-powered engine roar. This component features an easy to install bolt-on design and is made from 304 Stainless Steel that's TIG-Welded for racing-level durability. Look for the laser-etched Advanced Flow Engineering logo to ensure that you are getting an original aFe product.

Advanced Flow Engineering (aFe), Inc. is a trusted manufacturer of high performance air intake systems and filters that have been highly regarded by the automotive industry since 1999. This company has developed products that are ultimately an ideal solution for the most popular vehicle models in the market today. They have created their products using superior quality materials in order for it to last for so many years. aFe products are produced for late model cars, SUVs, and light trucks, and the product line includes fluid filters, cold air intakes, intake manifolds, exhaust systems, programmers, intercoolers, transmission pans, differential covers, and throttle body spacers.

aFe hires only high skilled and experienced engineers, production people, machinists, and sales people who work hard together on a daily basis to make sure that they generate only progressive and standard exceeding products for the automotive industry. The product line of aFe includes more than 2,500 applications, and all their extremely durable products are designed, developed, and manufactured in California, particularly in Corona. Furthermore, all the long line of aFe products are duly backed with a manufacturer's warranty to guarantee a quality unlike any other.