Goodwin Racing RoadsterSport Mid Pipe - NC

Goodwin Racing RoadsterSport Mid Pipe - NC

Goodwin Racing RoadsterSport Street Catted Header - NC

Goodwin Racing RoadsterSport Street Catted Header - NC

Goodwin Racing RoadsterSport Helmholtz Mid Pipe - NC

$849.00
Goodwin Racing RoadsterSport Helmholtz Mid Pipe - NC - No more drone! Please note that additional shipping charges may apply due to the box sizes for Goodwin products. Contact us for additional shipping details.
Availability: In stock
SKU
61-1738

A revolution in exhaust technology finally in a Miata application, this midpipe features an exclusive Helmholtz Resonator that massively reduces the standing wave 'boominess' inside the exhaust system BEFORE it gets to your muffler of choice! Cuts the 'booming' frequencies of 120-130hz by 48+db inside a top up Miata cabin which is a common source of complaints with aftermarket exhausts on the MX5. Bottom line: makes ANY exhaust system sound MUCH better!

We outfitted our Project 2012 PRHT Miata with a computer and sound spectrum analyzer and microphones and drove it under varying conditions and loads with mufflers and without any muffler to measure the frequencies coming out the midpipe. We then use that data and some special software to calculate the particulars of the Helmholtz chamber needed to precisely knock down the frequencies we do not want to hear while allowing the good throaty burble fun sounds to pass through. The result is all the fun, an almost exotic burble throaty result, without the drone! Note it is very dual personality because the effect of the Helmholtz is very frequency specific such that under decel it is mild and quiet, yet when you push hard toward redline it sounds exotic and racy. With the top down lots of fun throaty burble, but dramatically more tame when the top is up. In brief, FUN when you want it, and mild when just cruising.

Designed as a bolt-on replacement for the factory midpipe to carry higher flow all the way out any of our mufflers. Works with ANY of our muffler choices and customers report great results with everything from our RoadsterSport line to the original MazdaSpeed Mufflers. Simple Bolt on.

INCLUDES TWO O2 SENSOR bungs which gives YOU the option to later add our RoadsterSport headers 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 larger diameter than stock for superior flow, particularly when matched to our headers. 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).

This midpipe will raise the final sound level because of the higher flow larger diameter tubing and because the Helmholtz is frequency specific in operation.

SORRY, NOT CARB APPROVED, NOT LEGAL ON CALIFORNIA HIGHWAYS. 

Read full installation hints and notes in our forum Installation Instruction Section! (Click "Forum" at the top of our site, go to installation instruction section, and look for NC/ND Midpipe install thread).

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