Quite right. Part of the catalyst warm up strategy.
Mazdaâs Technical Guide calls it âENGINE START FEELING ENHANCEMENTâ
And describes it:
âWhen the push start button is pressed and the engine completes combustion, the engine revs up suddenly to enhance the feeling of the engine start-up.â
The higher idle speed during warm up is to help get the engine warm quicker and meet emission regulations.
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Yes not bothered about the initial cold start sound. Itâs the blip that @Roadster_Robbie has eluded to that isnât necessary
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All your points are duly noted, But I had my MX5 NC lowered 30mm and the steering felt better than at Mazda specificationâŚ
I got the horns to work just before i sent them back. Actually, instead of being grounded through the back mounting nut (as the previous pair were) the ground was the second spade end connector (the previous pair had 2 that were common positive). So, sounding good and loud again now.
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If you start an ND in Reverse, then it doesnât do the fast-rev start-up. Handy if you need to get a quiet getaway 
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After you change your springs or coilovers and the car rests at a lower ride height, you have to do a re-alignment otherwise the wheels will not be at the correct (intended) geometry.
This is the essence of what I said earlier
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Yes indeed. I noted what you said on that occasion⌠However, someone did mention that With the MX5 geometry It usually gets away with this !
As the amount ( where it matters ) is so infinitesimal, that Having it adjusted By someone â other â than an expert, Can sometimes fail to
Correct the tiny adjustmentâŚ. I donât know about such things Iâm just
Reciting what someone had said to me after I had my car lowered ! I have checked it out. No undue tyre wear and the car drives straight ⌠feeling as it should⌠etc
Anyway. Thanks for your reply, duly noted⌠best regards from Ray Hill
Essex branch north Thames âŚ. 
To get the oil around to all the top end parts as quickly as possible ? Maybe.
just a guess from me.
One could say. The exact opposite ! ââ why rev an engine before the oil has got around the top parts â.EtcâŚ. I donât know !
But I imagine that the oil gets around very quickly indeed If the oil pressure light is anything to go by âŚ. So itâs all swings and roundabouts âŚ
Of course It could be That the air fuel mixture is temporarily changed as with the â choke â setting with older cars⌠my wife used to hang her handbag on the chock lever and wondered why the car sputtered to a stop 3 miles laterâŚ
Iâve got to stand up for @anon35904086 here.
I was disappointed to read a couple of the responses to your post, reading through it as a neutral I just saw you offering some advise on a potential issue. Nowt wrong there, thatâs what a community forum is for isnât it?
For what its worth, should you ever spot something that may be an issue on one of my posts (as in-frequently as I make them), Iâll be very happy to hear from you 
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Just fitted new upper/lower shift boots courtesy of MX5 parts, as well as replaced the gearbox oil with RedLine from BOFI. The old gearbox oil was dark brown so it was definitely due a change.
Worryingly, there was no oil in the shifter turret, so I whacked about 100ml of redline gear oil in the turret before sealing it off.
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Taking advantage of the fine weather and giving the front of my NC some love.
As many will know, the headlights can take some bashing from the roads and UV. Mine were no exception.
Yellowing and quite hazy so bumper off and using Holts repair kit.
Before
During
After
Can be quite unnerving doing it but with patience and time, I think the results speak for themselves
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Good recovery on those.
They look like newđ
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Yes, thanks, they do. Well pleased. Took the opportunity to change all the bulbs too as getting to the bulbs on these NCâs is a pig.
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Been there and done thatđ
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Sparkling result.
Great job well done
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If you spray them with 2k lacquer it will help protect the finish against uv.
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Drivers side skirt removed on Sport Black to see how it looks for rust after 11 years on the road.
Not too badâŚ
I bought replacement clips, prior to removal, from Vehicle Clips.
Less than a fiver for 20!
The skirt bracket on left hand side of drivers door sheared (glued back on) but all the clips were intact.
Passenger side tomorrowđ
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Yeah mine pretty much went the same way on one skirt on the NC1, a broken bracket which i glued back.