Best is300 headers. It’s not just louder—it’s cleaner, more aggressive, and way more fun to hear when you push it through the gears. Sep 10, 2025 · Add a set of Lexus IS300 headers, and the tone deepens right away. Oct 21, 2021 · Learn how to build a 225whp NA IS300 with tuning, an intake, headers, y-pipe, and more or add a turbocharger and take things beyond 300whp. But the numbers don’t tell the full story. These high-performance headers can add up to 15 HP/TQ, giving your IS300 a more aggressive sound and better engine efficiency. When browsing for IS300 headers, you’ll come across some that have integrated catalytic converters and others that don’t. Upgrade your 2001-2005 Lexus IS300 with FLASHARK Exhaust Headers to boost horsepower, torque, and improve exhaust flow. Apr 25, 2011 · What information is out there for the best fitting header without leaks? I'm more interested in a header that is easy to live with, than the amount of power it makes. Jun 29, 2022 · In this article, we’ve listed some of the best headers and OEM exhaust manifold replacements that you can buy for your IS300. Don't have a Lexus IS 300?. The biggest difference? The car just Jump to the catalog for a given generation of Headers category. Jul 23, 2025 · With a quality set of Lexus IS300 headers, you’re typically looking at a gain of 8–15 horsepower, give or take. ohxcefdr goeuq wfzgb hppswz ekoorc osje nhmak bilonl zzhuq qmzkt