MagnaFlow MX-5 Midpipe with CARB Catalytic Converter

Here is my review of the Carb legal header 61-2340B and mid pipe 61-2199. Feel free use any, all, or none of it. Sorry it is so long, but I had a lot of good things to say!

I was totally ready to be underwhelmed by this mod from reading the descriptions on the Goodwin site. My OEM header catalytic converter had failed and I needed a replacement. The OEM is such a terrible design, I wasn't going to go OEM even though it was cheaper. Living in California I needed a CARB legal header. Since I was doing the header I decided to also upgrade the mid pipe too. Both of these units are manufactured by Magnaflow and sold through GWR.

I was pleasantly surprised at the improved torque at low RPMs and increased power all the way up to redline. My NC now pulls out of corners way better when the RPMs are low. Used to be, no power until 4000 RPMs. The car also runs up to the rev limiter way faster. It doesn't seem to strain as much over 5000 RPMs. On a circuit I always drive, I found myself going 10mph faster than my normal pace, with way less downshifting to stay in the power band.

I have a GWR Super Q muffler. My only complaint about it was, it always seemed a bit too quiet. I heard more intake sound then exhaust sound under hard acceleration. That changed significantly with the new header and mid pipe. Idle tone is now deep and rumbly. Under deceleration there is now a nice deep burbling sound. Zero drone at any speed. Under hard acceleration the car sounds like a real sports car and howls up to redline at 7800. Not annoying loud, but just right for a sports car. I have always said the most significant upgrade to power on my NC3 was an ECU tune. I think the header and mid pipe combo may match that increase.

-- Daniel B. ( 2014 NC Sport ) July 2020

Would you guys like a review of my recently purchased from GWR Carb legal header and mid pipe? I know you can't say either product enhances power, but I can. Combined with the Super Q the exhause tone is also amazing. Previously I felt the Super Q was too quiet and was going to order the street single. This setup rumbles at low RPMs,burbles under compression, and snarls like a beast when you get to redline.

-- Dan B. July 2020

Price is high, thankfully I bought this before the increase. It seems to add a little torque, is six pounds lighter than the stock midpipe and ups the sound a little bit. Goes great with the Roadster sport street catted header and the Roadster sport2 muffler.

-- John S., Menifee, Ca ( MX5 2013 red club 6 speed ) May 2020