4 years ago, we released the 60.5mm Exhaust kit for the 3rd Gen Mazda 3 (both in
The Dirty Details
Now I know what you’re thinking, an 80mm exhaust for Mazda 3 seems excessively large for a naturally aspirated car making less than 200whp. But, hear me out because I think you’ll like what’s coming.
80mm piping allows for some unique & louder tones its smaller little brother can’t offer, but it wasn’t as easy as just using the old design and making the pipes larger. We had to do quite a bit of resonator experimentation and NVH analysis to get to the finished result with as little drone as possible. I’ll be upfront with you guys though, this is loud. It’s a good loud with tons of fun noises, but if you’re looking for something subtler, then our 60.5mm cat back or axle back may be a better fit. We do a good job of capturing the audio for you though so you have a good understanding of what you’re getting. Be sure to check out the product video to hear it.
The Beauty of the Design
For those wanting this more aggressive exhaust note, sound isn’t the only bonus. We thought about the appearance, and how we could take advantage of this time to tinker with the design. The 80mm does a nice job of not only filling the exhaust tunnel under the car, but the axle back portion is a bit more prominent when you catch a glance.
On the Hatchbacks, the exhaust tips got a nice size increase up to 100mm and they are slant cut to help follow the profile of the bumper. Sedans have also been upsized to 100mm tips, which were lowered slightly to ensure your bumper doesn’t melt with the large piping. This has the added bonus of making the tips a little more visible from the rear and side of the car. In both cases, the way the upsized exhaust accents the rear of the car provides an aftermarket look, that’s classy and somehow the way it always should have been from the factory.
CorkSport Quality
As with every CorkSport exhaust, this new 80mm Mazda 3 Cat Back Exhaust variant is made from fully polished T-304 stainless steel for long-lasting corrosion resistance. All flanges, hangers, and resonators are precision TIG welded in place while all of the piping is made with smooth mandrel bends. Each resonator uses a direct flow-thru design to keep the drone down and the volume up without sacrificing power.
Power Levels
Speaking of power, check out the dyno graph below. The upsize to 80mm showed similar power gains as the 60.5mm variant, so the extra size isn’t really needed at similar to stock power levels (aside from the great noise of course!). The only change in parts or tune between the two graphs was the exhaust. OEM exhaust (red) vs. CorkSport Mazda 3 80mm Exhaust (green).
We also believe it’s also very important to be prepared. Future proofing your car for mods down the road is always a great idea, and you’ve probably heard that we have a turbo kit (yes it’s still happening!) and race header in the works. More on those projects later, but I’ll let you put 2 & 2 together…
Because it took a little too long and I wanted something a little more aggressive, I went with the HKS axle back exhaust. But I’m lote than ready for the turbo kit and header that’s in the works. Maybe you guys will be able to provide and engine rebuild later down then line as well
I bought the 60.5mm catback within a week of getting my 16” hatch m3, are you guys able to take it back for the difference of the prices or would I have to buy a new one entirely? You guys rock thanks for keeping us m3 people in the loop on your future plans.
How loud in decibels is the new 80mm cat back exhaust for the mazda 3 2014+? I am wondering if it passes the CA Exhaust Noise Law..
Hi Edward,
Here’s a sound clip to give you an idea: https://www.youtube.com/watch?v=Dds3VGyKwOw