I own a 1990 Miata and would really like to put a SR20 DET into it but, I have yet to find any referances to this particular swap anywhere. So if anyone knows any sites that feture the do's and don't or even just a pic of the engine bay it would be a great help to me.  By the way yes I have seen the V8 swapps also the norm. turbo upgrades for this car I've even seen the 13B rotory swap from the 1st gen RX7. However I just like the SR20 engine in my mind it seems like a perfect choise for the miata.  I would like to get 265hp-375hp at the wheels even the stock 210hp is more that I need in a 2200lb car. Any help on this matter would be greatly appreciated.  TY  

I think Sport Compact Car had an article about this a little while back.  

I saw one to but it was for the 13B in spring 2005, never saw one for the SR20, I'M starting to wonder if anyones ever done one before.  I'm checking back issues in ssc but no luck yet. ty anyway  

To swap SR-20DET into Miata, a complete parts kit is available for bolting SR-20 from Nissan S13, S14, S15 and 5 speed gearbox from S13, S14 directly into Miata with NO cutting of subframe, bonnet or steering rack position.

http://www.miatasr20.com/
has details, prices and photos of kit bolted to SR engine / gearbox to show quality of work.

The kit includes engine mountings (using the Miata rubber mounts in standard position to bolt to the SR-20) and gearbox adapter that bolts directly to Nissan gearbox to connect to the Mazda Power-Plant Frame (ppf). Gearbox fits into Miata body with clearance and shifter fits in original position.

A fully fabricated sump is available that is a direct bolt-on replacement that has integral oil passageway and pick-up, includes a stainless steel pressed oil separator tray - full length of engine and all hardware. Sump is level with lower edge of subframe (fully protected and no loss of ground clearance) and allows engine to fit under standard bonnet. Sump has been extensively tested in motor-sport application.

Kit takes away all the hard work of installation whilst keeping engine, gearbox and Miata suspension, steering standard for ease of replacement parts etc. Kit has been available since 2004.