3 Inch Exhaust?
 

Does anyone make 3 inch exhaust for an NA miata anymore? Looking for a bolt in system that will connect to the stock cat (or test pipe).

try here
 

If he is still in business, try jason at enthusacar.com.

I don't think he has been building exhausts for years. Several people on here have tried to get exhausts from him with not great success.

I believe KMiata sells a 3" exhaust. Otherwise I don't think anyone does.

Kraken recently started offering their 3" exhaust separate from their turbo kit. You can configure it with a cat, resonator, muffler and whatever flange you want.

They're doing free shipping until the end of the month. I also believe they're raising prices within the next month.

Do you mean Kpower? Sounds like their exhaust only bolts to theor downpipe. But I emailed them to check.

I didn't see an option for it to bolt to the stock cat, but I emailed them to check.

They have an option for a removeable test pipe, although I suppose that's V-banded in, so it won't bolt straight up to the stock cat. Sorry, I missed that bit in the original post. I wouldn't be surprised if they'd weld the 2 bolt flange onto the test pipe end though if you wanted to.

If you don't hear back via email, they usually respond on FB messenger in a day or less.

They got back to me, KPower does not fit NA8 engines.

Where are you located? Maybe someone can suggest a fabricator local to you that can make one.

Why do you want a 3" exhaust when you want to neck it down to fit a stock cat with a 2" pipe?

Yep, 2,5" is enough for a N/A BP

The only time I'd consider 3" is if it was mated to a turbo system, where the other parts get replaced anyway. It's pointless for anyone to make one that bolts to the stock cat 🐈●

Hmm... I figured it would have been obvious on miataturbo.net that this would bolt to a turbo miata engine. Anyways, the requirement/hope is that it has the capability of bolting to the stock cat, or test pipe for track use, if that makes sense.

If you spent more than 5 minutes here, you'd see that there are plenty of stock non turbo cars. And guess what, even supercharger setups, so no just because it says miataturbo.net doesn't mean that's the only thing allowed. 🤡

Take a minute and put your build info in your signature. But remember we can't see it on mobile. So it also helps to put that info in your first post.

Sitting here trying to guess your setup and answer a question that's easily found is a waste of everyone's time.

Pretty much

When I read your first post, I misread NA as meaning intended for a stock, "naturally aspirated", and asking about an OEM compatible cat-back reinforced it in my mind. I do now realize you meant 1st generation though, but I think you can see where I was coming from now.

So, just out of curiousity, is it so you can go back to the stock headers/cat for testing without removing the muffler?

That's correct, having the ability to swap the factory cat to a "test pipe" for offroad/track use is the goal. And yes I absoltely understand the ridiculousness of bolting a 3" cat back to the stock cat.

Is 2.5" catback sufficient for up to 250rwhp?

Kraken did not respond via email and there is an error when attempting to message them on facebook, something about European message service being updated.

Not an issue at all. It just won't be efficient as a 3". I've made over that with a 2560r and a Roadster Sport 3 muffler. It had a homemade 2.5" downpipe with a shitty crush bent catless midpipe from a generic muffler shop. I did a short test with a Virtual Dyno with and without the muffler and it was essentially unnoticeable within Virtual Dyno's margin of error. It just made it miserably loud.

You'll likely find just like I did, a quality straight-through style muffler will not be the limiting factor.

I have used one company's downpipe and another company's cat back and had a local exhaust shop connect the two with success. Talk to local shops about what they can build, too.