No matter the condition of your 1970 Riviera, OPGI has the Mufflers & Resonators you need to boost performance and get you back on the road. We currently carry 116 Mufflers & Resonators to choose from for your 1970 Riviera, and our Price Match Guaranteed prices range from as little as $45.99 up to $567.99. OPGI offers Magnaflow plus six other trusted brands of Mufflers & Resonators for your 1970 Riviera, to help you find quality parts you can rely on. With OPGI's 45-day return policy and thousands of 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 Mufflers & Resonators in person.