I have a 88 shiro turbo 300zx.... everytime I down shift the car smokes bad but if i use the brakes only it dosent ......I think the turbo is finished and is leaking oil...What do you think?????? also I want to put on a turbo off of a 84-86 300zx...will it fit??? or do I have to change the manifold also?? I know the turbo on my 88 is smaller but dont know if the 84-86 T3 will bolt on easy or not or even work PLEASE HELP IF YOU KNOW!!!!