Both the k14 and t2 already used on the 1.9 are considerably bigger than the ko3 already and will be a direct bolt on with the only the manifold needing to be changed.Both of these turbos are good for 20 psi and a considerable amount of fuel while still giving great spool up,unlike the t3,k24.The t3,k24 will work but are not worth installing if your not looking for over 100hp 25+psi boost.In the end It may just depend on which turbo is the easiest to come by