Integrated Merge Spike. While it might sound like something you'd be likely to find in some sort of medieval torture chamber, it's just one of the innovations that Stainless Works has come up with to improve the way exhaust systems work. As you might surmise by its name, Stainless Works manufactures its headers and exhausts out of high-quality stainless steel (in most cases, Everlast 304L), ensuring that your new exhaust will stand the test of time in both looks and performance. Stainless Works is known for its great fitment and quality construction, and we know that you'll be happy should you decide to go with a Stainless Works exhaust for your performance needs.