No matter the condition of your 1984 Bonneville, OPGI has the Headers products you need to boost performance and get you back on the road. We currently carry 37 Headers items to choose from for your 1984 Bonneville, and our Price Match Guaranteed prices range from as little as $41.99 up to $1,089.99. OPGI offers Hedman Hedders plus six other trusted brands of Headers products for your 1984 Bonneville, to help you find quality parts you can rely on. With OPGI's 45-day return policy and two customer reviews, you can shop with the utmost confidence. Enjoy parts delivered directly to your home, or visit our sunny Southern California Showroom & Warehouse to check out our Headers items in person.