RoadsterSport "SUPER-Q" Header Version Stainless Steel PREMIUM ADJUSTABLE Sound MX5 Miata Exhaust

Special version of SuperQ with added 3.5 inch diameter resonator on the inlet to kill the RASP that is added with adding a standard length highflow header to the ND. Otherwise similar to normal SuperQ, see our standard SuperQ product description for more. STRONGLY recommended for those getting a header!!

Brian's Application Notes: This is the cure for raspy sounds unleashed by a catless performance header, an extra resonator on the inlet pipe you can just barely see in the pictures is the secret sauce of this version. If confused by your choices, give us a call or drop us an email to discuss. This muffler is proudly made in the USA with a LIFETIME WARRANTY and is emissions legal in all 50 states. Our pipe size is bigger than OEM for best performance/flow and the stock donut gasket sinks a bit deeper into the mouth of our setup than with factory muffler 'mouth'. Note that our flange at entrance to muffler is designed as a dual purpose item that allows going to flat gasket if you later go with our 2.5 inch midpipe, at which point the midpipe has a flex joint to replace function of the donut and you get a clean 2.5 inches of flow all the way, which is not possible if we stay same small pipe of stock muffler.

If you have more than 20,000 miles add a fresh donut gasket, our item 61-2144 (factory part number RFK2-40-581). The factory designed the joint between muffler and midpipe as BOTH a flex joint and a sealing point and the impregnated graphite 'donut' gasket slowly grinds itself thinner and thinner. Those under 20k miles usually find the original still works great, those over about 20k miles usually best to start with fresh donut.

INSTALL NOTES:

Installation of this Miata exhaust is SUPER EASY...just two 14mm bolts to loosen! When you open the big box you will find separate foam wrap on the exhaust tip, leave that foam around the tip during your install to protect the polished tips and your car's soft plastic in the exhaust cutout. Use gloves. Note the 'bolts' from the factory are actually studs with springs and nuts and the factory usually jams the nuts on so hard that unbolting it will bring the stud out too. If that does not happen then use a 13mm long socket to pull the stud, or use jam nut technique where both nuts are put on one stud against each other and then wrench used on the inner of the two to back out the stud. Then lube up the stock exhaust hangers with dish soap and yank stock muffler back and forth to work the soap into the rubber hangers and then the muffler will slide off those rubber hangers easily. Then hang the new muffler on the wet and soapy rubber hangers and torque 'bolts' with the springs back in place to 30ft/lbs. Now you can remove foam tip wrap. Option to remove the baffle too, to do so loosen bolt that holds it from under the exhaust tip and use it as handle to shake the baffle loose and then unscrew bolt the rest of the way and pull the baffle (pulling baffle raises the sound slightly). If you don't pull the baffle, put a socket on the nut and double check it is properly torqued before you drive (with lock washer just 15 ft/lbs is plenty, don't overdo it). Note the muffler to midpipe joint is a ball socket connection for the first time on a Miata, it is designed to move a lot, so please do not add sealants that will gum up that dry ball socket joint. Note that our flange at entrance to muffler is designed as a dual purpose item that allows going to flat gasket if you later go with our 2.5 inch midpipe, at which point the midpipe has a flex joint to replace function of the donut and you get a clean 2.5 inches of flow all the way, which is not possible if we stay same small pipe of stock muffler.