b'GM F/X AXT-RSXRSRT/JRI Double Adjustable Rear Shocks with Canister:oCutting Edge Bleed Shaft Shock Technology Allows the JRI Shock the Widest Tie-Down Range While Keeping High Speed Valving Consistent for Better Bump Control oThe Shaft Technology Allows Us to Get Mean with theTie-Down & Not Suffer Loss of Grip Over BumpsoThe Canister & Low Nitrogen Pressure Create Grip onUneven Track Surfaces Found on Autocross & Track oRon Sutton Famous Secret Sauce High Grip RearValving Utilizes Tie-Down Technology to Create MoreRear Grip on Entry under Braking & Acceleration on Exit oYou Can Quik-Tune the Tie-Down Time with the Blue ClickStyle Adjuster Knob on the Shock Head / No Tools Needed o80 Clicks Tunes the Tie-Down Force from 0# to 400# o0-160# for Autocross / 80-240# for Road Courses oSeparate Compression Valving Adjuster on Canister oA Great Dual Purpose Autocross & Road Course Shock Draco Professional Racing Rear Springs:oPro Racing Teams Primary Use Only Two Spring Brands oWe Prefer Dracos use of 9000 Series Steel Spring Wire oNever Sags or Settles. Never Loses Rate. PeriodoSpring Rate Dyno Graph Sheet with EVERY Spring oVery Accurate & Linear Rates Over Long Travel oThe Common Car Guy Thinks a Spring is a SpringoBut Pro Racers Know Draco Springs Make a Better Handling,More Responsive & Higher Grip Race Car. Why Settle for Less?Tech Tip 17: All suspension springs are not created equal. The spring steel material & the processes utilized in manufacturing the spring, play a big role in the PERFORMANCE of the spring. For decades all production car & race springsleaf & coilwere made with 2000 series steelbasically crapthat responded slow, sagged & lost rate with time & use.Hyperco came out coil springs made with 4000 series steel for Indy Cars back in the 80s. The 4000 series steel is simply a superior steel to the 2000 series. Much more expensive, but it sags less, loses rate less & responds faster than 2000. Today, AFCO, Eibach & others spring manufactures make coil springs from 4000 series steel.Japanese firm Swift makes springs with 5000 series steel that are even better than the all the 4000 series steel springs. Again, a little more money, but better. But the very best springs are made from 9000 series spring steel from Renton & Draco. Amazingly quick response. No sag. Zero. No rate loss. Ever. Renton makes NASCAR springs. No coil-overs. Draco has a full line.In on track tests with data loggers & shock travel sensorscomparing 4000 series springs to Draco 9000 series springswith the exact same rateshave proven to make the suspension respond quicker, create more grip & run faster lap times. Funny thing is, were only talking a little bit more money. Draco coil-over springs are about $40 more than Hyperco, Eibach, AFCO, etc. The more you knowthe faster you can go.560'