how do you know which one you have and what do you have to look for on a 13b tii to know if the whireing will work??

 

You can look at the number of fan blades, waterpump neck and omp.

S5's have 10 fan blades and s4's have 8 I think.

S4's have a metal waterpump necks while s5's are plastic.

S4's have mechanical omp's and s5's have electronic ones.

 

thanks

 

On the s4 housings there are some writing on the top. The s4 has a totally different intake from the s5.

 

the s4 has and egr valve under the intake manifold, and no egr on the s5.