Ok I was just sold a motor thats suppose to be a 13b REW with S4 intake/exhaust and turbo. Couple questions. How do I tell if its a genuine 98 13b REW and whats the diff between that motor and just a run of the mill 13bt?

 

13bt vs. 13b-REW.... Larger intake ports. Take the S4 intake manifold off and the intake ports on the manifold should be quite a bit smaller than the ports on the engine (unless it was matched to it). Another way to tell is by the presence of a serpentine belt system. That sounds like a pretty flaky deal to me.... Why would someone go to the trouble to put a REW into a S4? With the S4 intake and turbo setup, if the intake ports are unmatched and the turbo is a factory S4 turbo, they'd barely be making any HP gains (maybe 50hp tops). Hmmm......

 

s4 intake and exhaust has all be port matched and had the egr and restrictors removed and the s4 turbo has beeu upgraded... and the best part is its in a 1960lb sa22..