If you're diving into a custom fabrication project, whether it’s for your daily driver or a track toy, the HPS AJ300-350 Aluminum Joiner is a solid choice. Designed specifically for automotive applications, this joiner is perfect for creating DIY air intakes, cooling systems, or turbo intercooler piping setups. With its robust construction and precise dimensions, it’s built to meet the demands of both performance and durability.
This joiner features a 3-1/2" (89mm) outside diameter and a length of 3", making it a versatile component for a variety of vehicles. Its 2mm wall thickness ensures it can handle the pressures and temperatures typical in high-performance applications. Whether you’re working on a turbocharged setup or enhancing your cooling efficiency, this joiner fits seamlessly into your existing system.
Car owners appreciate the HPS AJ300-350 for its reliability and ease of installation. For example, a 2021 Ford F-150 owner mentioned, “I used this joiner to connect my new air intake system, and it fit perfectly. The added flow made a noticeable difference in throttle response!”
Another user, a 2019 Subaru WRX owner, shared, “This joiner was exactly what I needed to complete my intercooler piping. No leaks, and the fitment was spot on.”
With applications in automotive, marine, and aerospace industries, this joiner is not just for show; it’s built to perform. When you’re ready to take your project to the next level, the HPS AJ300-350 Aluminum Joiner is the reliable choice for any serious builder.
⚠ WARNING:
Cancer and Reproductive Harm
https://www.P65Warnings.ca.gov

HPS Performance Products is a leading manufacturer of aftermarket performance parts, fabrication components, and silicone hoses. HPS serves a number of different industries, including automotive, aerospace, construction, commercial truck/bus, marine, agricultural, turbo diesel, off-road, performance racing, general manufacturing, and water treatment. The company’s ability to fabricate custom-shaped multiply silicone hoses make it ideal for a wide range of applications. The multiply carcass makes HPS’ hose perfect for coolant and turbocharged pressure applications while the fluoro-silicone-lined hoses make it safe to be used with petroleum-based oil and fuel.
HPS Performance Products is committed to meeting its original goals of producing quality parts at competitive pricing and providing customer service responses in a personal, timely manner. All HPS products have been thoroughly tested on the dyno and track, and meet or exceed SAEJ20 standards. The HPS staff has solid expertise in the silicone hose department, which allows them to deliver standard size silicone hoses with same-day shipping. HPS’ highly skilled and knowledgeable team, paired with the latest state-of-the-art technology, ensures the brand’s continued success and reputation as a premier manufacturer in the industry
HPS Quality Silicone HosesHPS Performance Products specializes in and is best known for manufacturing multi-application silicone hoses. HPS silicone hoses are carefully crafted from only the highest quality 4-ply reinforced high-temperature material. The hoses are available in the following varieties: straight coupler, 1-foot tube, 3-foot coolant tube, charge air cooler hose (CAC), hump coupler, reducer couple her, 45-degree elbow coupler and reducer, and 90-degree elbow coupler and reducer.
HPS Performance Products also carries performance silicone vacuum hoses and silicone heater hoses. You can choose silicone hoses in both standard inch and hard-to-find metric sizes. Stainless steel T-bolt clamps are available to match with the silicone hoses as well. In order to meet the high demand and shorten the turnaround time for its silicone hoses, up to 90 percent of the product is already in stock and ready to ship or pick up from HPS authorized dealers like Vivid Racing.
HPS Performance Products at Vivid RacingVivid Racing carries a comprehensive lineup of HPS Performance Products for a number of different makes, models, and applications. Our extensive inventory of HPS parts includes aluminum tubing, cold air and short ram intakes, vacuum lines, hoses and clamps, intercooler pipes, radiator caps, and much more! If you have any questions regarding the items listed above or have fitment concerns, please contact our expert sales team at (480) 966-3040. We are here to help you through the entire purchase process and make it a pleasant experience.