You can make pretty much any small turbocharger work on an MN12, with time and money.
Know however that ANY turbocharger you go with will require extensive custom plumbing for exhaust, intake, etc. etc. From what I've read here, you should worry more about the fabrication and all the required "bits-n-pieces" of the plumbing than the turbo itself.
There have been a few successful retrofits, which have been cataloged here in the Turbocharging subforum; however look and see how much trouble it is, how long it takes, what is involved, etc. before you start getting in too deep. At the bottom of the turbo forum, set the "display options" to show you all threads from the beginning and take a look at who has been successful and who hasn't quite made it. There are at least two builds going on currently that have been in such a state for some time now (ironworker and tx_cat).
97 Laser Red Thunderbird LX161k, Stage 2 4.6L 2v N/A | 300 BHP (255 RWHP, 290 RWTQ) | 13.95 @ 97.58 | Build details | Pics at the Lorain Assembly plant 98 Black Mark VIII 155k, stock daily driver 07 Redfire Fusion V6 SEL 178k, for the wife Gone but not forgotten: 96 Mark VIII, 94 Cougar XR7, 93 Mark VIII
TCCoA's resident pilot since 2014 Once you have tasted flight, you will walk the world with your eyes turned skyward, for there you have been and there you long to return. -Leonardo da Vinci
The cheapest turbos that aren't junk are made in Brazil by Master Power. A T-70 with a T04 flange is a good size for a 4.6. If you want a real good turbo, use Garrett, Prescision, Borg Warner, Bullseye, Turbonetics or one of the other brand names.
find the smallest turbos you can and do a quad set up with 2.5psi to each trubo
Beater lx,current mods: cold air,drilled and slotted rotors,glass pack muffler. Scrapped
Teal terror 94...trans slip and a fram air hog filter!
94 Sc :Cobra R hood,96-97 Front lights,3.73 Trac Lok,1" Raised top,5% OD Blower Pulley,CAI,Removed resonator,Gutted cats,No mufflers. "It roams around in a open loop speed density tune. killing small children and raping helpless mothers at night."
....THAT DOES NOT MATTER!....
lolzzzz if you run a cheap turbo make sure you use a good intercooler to cach the parts if it goes south i know a few guys that have the ebay turbo and use it for mock-up and i know a few that ran them on there drag only cars i wouldnt use one on the street
"Chuck Norris built my shortblock. It runs on the tears of small children and makes 10,000 hp. He said it's his 'street version' "
wheel hoppin and poppin!
91 Thunderbird sport 357W 5speed
88 stripped out 5.0 C4 and 4:56 gears in a 9in Ford