ok people, i have been workign at a shop for a while now, and i go to school for autotech... l4 ppl listen UP..
the older mx6 turbo motors bolt right into your l4 tranny, we done it before, you can keep the old turbo set up and just do some internals and it will already be pretty damn fast.
or if u are serious about turboing your l4, do your calculations right, dont over size the turbo tubing, that will just create lag, get the proper turbo (i suggest the hybrid t3/t4) and dont over kill the exhaust piping either. if your not running that much psi go for 2 1/2 tubing. if your aiming for higher psi get bigger tubing.. simple...
oh and for ppl who really want to get turbo, BE sure to upgrade your fuel system! if u drive reasonably hard even at low boost, your engine can still blow faster than u would expect. get some kind of fuel management. or just go with the Apexi s-afc. oh and ppl when going for higher psi ( say anything over 7-9 psi) in an l4 be sure to get internals done! do what u have to do. it is better to run a little bit more rich than lean if your running turbo, prevents you from blowing up.
if the fs ze head does fit on the l4 (not to sure never tried) i would give it a valve job,port and polish, and stick it to the build block, as for blowing gaskets and such, get the outlaw thermoblock spacers. for i-m get it done so it has larger air flow, and pay someone to build u an oversized t-b, or find a bigger one that fits. over all, u just cant step into one field of tuning (ex. force induction) and not touch anything else, if u touch something, start working on other areas without raping the crap out of the car yet. go buck when you feel your car can handle what u can put it through.
go big or go home
oh and my car is not what is listed underneath anymore, ive changed a lot since i posted that