Sportier Exhausts for the NB and NC Miatas Courtesy Holley

Give your NB or NC Miata a bark to match its bite courtesy of Holley's new line of Hooker Blackheart exhaust systems. Holley says that the systems–offered in both axle-back and cat-back exhausts–can add up to 4 horsepower and 3 lb.-ft. of torque for the NB, and up to 6.5 horsepower and 8.5 lb.-ft. of torque for the NC.

Both setups use the OEM hanger locations and feature a limited lifetime warranty.

NB Miata cat-back exhaust system:

https://www.youtube.com/embed/JRo2WjpKp0s

NB Miata axle-back exhaust system:

https://www.youtube.com/embed/969fnBVct8E

NC Miata axle-back exhaust system:

https://www.youtube.com/embed/3sPf3Vq1TJA

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Comments
View comments on the GRM forums
_
_ Dork
2/25/20 5:06 p.m.

These guys are late to the game. And on the nc, they would recognize better gains with a better header design than stock. 
 

edit: my roadster sport exhaust sounds incredible compared to this. But this is also half the price I paid for mine. 

Olemiss540
Olemiss540 Reader
2/25/20 5:53 p.m.

Nice price for a cat back made from stainless IMO. Wonder why they dont highlight the weight as that's usually a huge selling point of these systems.

Strange the "peak" power improvements happen at a strange double dip in the stock tune right before/after 4000 rpms. Seems a bit like a funny sales tactic as I highly doubt the stock exhaust caused that weird power curve on the stock tune.....

Keith Tanner
Keith Tanner MegaDork
2/25/20 6:03 p.m.
Olemiss540 said:

Nice price for a cat back made from stainless IMO. Wonder why they dont highlight the weight as that's usually a huge selling point of these systems.

Strange the "peak" power improvements happen at a strange double dip in the stock tune right before/after 4000 rpms. Seems a bit like a funny sales tactic as I highly doubt the stock exhaust caused that weird power curve on the stock tune.....

You'd be surprised by some of the weird bumps in stock curves.

And you'd also be surprised how few people ask about weight of exhausts. It's far more likely they'll say "....I just don't want it to sound like a Honda, you know what I mean?"

_
_ Dork
2/26/20 12:32 a.m.

In reply to Keith Tanner :

And the saddest part of that is some Honda's sound good. It's just a crap stigma attached to ricers. Oh, crap. I just stigmatized ricers. 

AnthonyGS
AnthonyGS Dork
2/26/20 2:10 a.m.

In reply to _ :

I was just thinking how would this sound on a K24 swapped NB.....

alfadriver
alfadriver MegaDork
2/26/20 6:34 a.m.

In reply to Keith Tanner :

Sound is really important- I listened to the videos and thought it was an interesting interpretation of what "sporty" sounds like.  

To me, it's a little rough around the edges, where the FM system that came out about 5 years ago, the sound was much softer overall.  Still a little louder, but not that peaky rough part that is INCREDIBLY annoying over a long drive.  

The price is very inviting, but over the long term of ownership, I think I would be so annoyed over the droning sound that I would rather spend about 2x that for a better overall system.

NickD
NickD PowerDork
2/26/20 12:50 p.m.

Can they come out with one of their self-learning EFIs for Miatas next? I'd be all over that

s14blane
s14blane New Reader
2/26/20 2:19 p.m.

In reply to Olemiss540 :

Hey there Olemiss540, appears they are quite aware of the weight savings, it seems that GRM just didn't post the whole story from their press release. Here's the link to the release on their website. 

_
_ Dork
2/26/20 3:04 p.m.
NickD said:

Can they come out with one of their self-learning EFIs for Miatas next? I'd be all over that

I'm not sure why someone hasn't done that. A self learning stand alone is gold. Imagine the dyno time you can save. Just input turbo info and injector size. Tell it what car it's in. I would pay for that. 

Keith Tanner
Keith Tanner MegaDork
2/26/20 3:53 p.m.

Heck, the Link could auto tune 20 years ago. The Hydra was quite good at it. I'm sure the MS3 can do it now. Get a reasonable base map and let the ECU learn. 
 

Honda makes great engines. But they seem to require really well tuned muffler setups or they get really raspy. I think it's the high compression. Whatever the reason, they are used as the gold standard for what people do not want in an exhaust note. This is based on years of people calling up and asking what our exhausts sound like. Big Healey good, Honda bad. 
 

The NB engine has a tendency to drone at about 3000 rpm. That's the real challenge.

Olemiss540
Olemiss540 Reader
2/26/20 4:15 p.m.

In reply to s14blane :

But why not put it in the ad for the exhaust itself?? When shopping parts I dont typically google the press release docs, but head to the product page. Maybe I overlooked it though.

Stefan
Stefan MegaDork
2/26/20 5:11 p.m.
_ said:
NickD said:

Can they come out with one of their self-learning EFIs for Miatas next? I'd be all over that

I'm not sure why someone hasn't done that. A self learning stand alone is gold. Imagine the dyno time you can save. Just input turbo info and injector size. Tell it what car it's in. I would pay for that. 

My MS1 can autotune using TunerStudio on a laptop.  Put in the engine size, injector size, etc. and it will put out an approximate base tune. 

TunerStudio works with MS1-MS3, etc. and there are mobile solutions now for phones and tablets.

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