BTW - my impression of the gains from the Weapon R header are about what you get from the reflash and pulley's combined. Be prepared for lots of VTEC fun!
Weapon R Stainless Steel street headers are designed to be a direct bolt on requiring no modification. They are a direct replacement for your factory exhaust manifold, and offer a substaintial performance increase. Made from quality stainless steel with CNC machined exhaust flanges, they are designed not only for power production, but also long life. The Weapon R Headers are welded inside and out to make sure that your header doesn't crack, like some inferior designs from other companies. Weapon R headers are designed to be lightweight and have a limited lifetime warranty from Weapon R. Depending on your application, the Weapon R header is available in either a one piece or a two piece design, and 4-1 or 4-2-1. Weapon R does extensive testing to see which produces the most power for your car, and then offers only that version. Combine with a for the ultimate power combination!
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Exhaust System > Header & Downpipe & Testpipe > Weapon R Race Header