Time to put it in!
Time to put it in!
Success!
The 2.0-liter's intake manifold is reused, though one of its wiring clips has to be ground off in order to clear the 2.5-liter thermostat.
What's the deal with the blue Diablo in the background? A Miata shop is a strange place to find that.
It's SoCal, things like that just sort of show up if you leave a building unattended. 
In all seriousness, who among us can't say they've been distracted by a weird car every now and then? That thing is actually a V8-swapped Fiero underneath. 
Good-Win's 1.8-inch primary header is going on now.
$1500 in labor for this seems extremely fair! For shade-tree level folks like me, this is something I would definitely screw up.
And it's time for the intake manifold (leave the EGR tube loose so it can be finagled into the 2.5's slightly different spot:
Wiring is going back on:
Still on the to-do list:
The 2.0-liter engine's fuel rail and injectors are on the car now, too.
Time to go back under the car! We put the stock flywheel back on, both to keep costs down and to dampen the 2.5's vibrations.
We paired a used ACT pressure plate with a new disc, then bolted everything together and reinstalled the transmission and powerplant frame.
Next up: Exhaust. Anything that fits the 2.0-liter fits the 2.5, so we're using a Good-Win Racing RoadsterSport system.
Under tray is back on!
And the shifter:
Cowl trim is back in place:
And the ECU:
Time for fluids!
Because the 2.5-liter is taller than the 2.0, but uses the 2.0 oil pan, the dipstick doesn't read normally anymore. In a 2.5-swapped NC Miata, the low mark on the dipstick is the full mark.
Goodwin is uploading the Xero Limit MX-5 2.5-liter Conversion Tune now:
Add some spark plugs:
And coils:
Aaaaaaand.... TIME!
It runs! In less than 24 hours, we 2.5 swapped an NC Miata!
I love my 2.5L NC. So much that I have a SC that will be going on it soon. 
Tom
Thanks for documenting all that!!!!
For us uninitiated people, what car does the 2.5 liter engine come from?
Most popular source is the Fusion. You can also get it from the Escape.
You guys are right down the street from me. I want to come down and help!!
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