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RoadsterSport Stainless Steel MX5 Midpipe with High Flow Catalytic Converter And Resonator for 06-15 MX5


Price: $399.00
Item Number: GWR-RSMP-NC
Manufacturer: Good-Win-Racing
Good-win Racing Logo

RoadsterSport Stainless
MX5 Miata Midpipe
with Converter

2006-2015


Designed as a bolt-on replacement for the factory midpipe to carry the 2.5 inch outlet of the factory header, and the RoadsterSport and Racing Beat headers, all the way to any 2.5 inch inlet  mufflers. Simple Bolt on for MANUAL TRANSMISSION ONLY. Also bolts up to the Racing Beat exhaust, MazdaSpeed exhaust, stock header and Racing Beat header.

INCLUDES TWO O2 SENSOR CONNECTIONS which gives YOU the option to later add a RoadsterSport or Racing Beat header and avoid engine codes (by using our O2 plug and play extension cords to relocate the factory O2 sensors to before and after the converter in this midpipe).


All stainless steel construction for years of driving pleasure. This MX5 Miata midpipe is slightly larger diameter than stock at 2.5 inches all the way through (see torque gains in our forum dyno thread). Uses high quality SPUN catalytic converter with metal core (despite presence of converter this unit is not CARB approved...which makes it legal in California only for off-road/race track use). Uses monster 18 inch resonator because when you uncork this NC MX5 Miata motor it wants to get loud unless you use a resonator this large (by comparison stock resonator is about a foot long).
RoadsterSport Midpipe for NC

Stock midpipe is 20 pounds, our midpipe is 16.5 pounds for total savings of 3.5 pounds. Despite very large resonator, this midpipe will raise the final sound level just slightly because of the higher flow larger diameter tubing.

GOOD-WIN RACING'S APPLICATION NOTES:
They started with the much larger "two biscuit" cat they use in the 99-05 midpipe system but they didn't like the sound quality that resulted. This small single biscuit spun unit is actually more expensive than the big metal clamshell cat they use in the 99-05 system but they did some experimenting with cats of different sizes and the short chambered spun cat helps reduce that 3000 rpm DRONE/ BOOM that this motor really wants to make on decel when uncorked. The short cat also saves another 1.5 pounds as compared with the bigger cat.

As for sound level...with the big cat the sound volume level was really unchanged as compared with the stock midpipe but we made the tradeoff decision to reduce decel drone but finish with slightly higher overall volume using the short chambered spun cat and we think most will appreciate this choice.

NOT CARB APPROVED FOR CALIFORNIA RESIDENTS.
STR LEGAL under Class Rules Update 2012. Pursuant to SCCA 14.10.E: the cat is smaller than stock but fits entirely in the space that the factory cat occupied pursuant to SCCA 14.10.E....and Magnaflow certifies CA/CE 59956 cores for use in any application <6.2L and 6000 pounds. Core has 25,000 mile manufacturing defect warranty (no core warranty for boosted or track cars), and the rest (including housings) are stainless and include a lifetime warranty.

INSTALL TIP:
The slip joint in the middle is your friend and the mistake some will make is to shove both sides of the midpipe fully together, making it too short. Lube up that slip joint and adjust length as needed.

INSTALL NOTES and CAUTION!
Is one or more of your ignition coils weak or failing? One reason people buy this midpipe is that their factory midpipe converter has failed after 50,000 or more miles. The owners too often assume the failure is simple old age. Failing items such as coils, fuel pressure regulators, spark plugs, valves, plug and ignition wires, and improper ECU calibrations, can cause the engine to misfire and dump raw fuel into the catalytic converter, which will cause over heating and a meltdown in the converter, which is not a manufacturing defect in the converter. If you simply replace the midpipe and don't fix the failing car then you can expect to quickly kill any replacement converter and that replacement will NOT be a warranty replacement. Therefore, please have your car professionally inspected and repaired BEFORE you install your new midpipe.



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