I have this spare set up sitting around, not sure which series engine it came off, want to put it up for sale if I can figure out if its a S4 or S5 turbo and manifold

just the turbo and manifold?



i think s5 had no flapper door assembly and actuator, s4 does for sure



i forget what you call that design..

twin scroll!

Yeah, S4 has the little flapper for the twin scroll on it and S5 does not. Also, the S4 turbo flange is not perfectly rectangular, whereas the s5 is. Another diff, if you separate the turbo from the manifold, the ports on the turbine on the s4 are different sizes, one small, one big. The s5 ports are both the same size.

s5 turbo is bigger also differnt number then s4

s5 has 2 wastegateports, no twinscroll, the number is HT18s, can't remember what the s4 is, s4 **** sucks. except the body

turbo to manifold flange on an s5 is "square" with 2 ports, or its divided, manifold and turbo.



s4 is a 5 sided thing, turbo is divided, but not equally, and the manifold isnt divided

what about this HT18 thing? or should I just seperate the turbo from the manifold?

Im pretty sure its a S5 only because thats the only engine we got in that we took the turbo off, but now its been lost in the shuffle and were not sure if it definitly came off that S5 engine



it actually has almost no shaft play so it would be a good buy for someone who just wants a stock turbo set up

The number is cast on the cold side of the turbo is HT18S, not sure if the s4 is any different.

S4 has HT18s-2s. If the manifold has an actuator arm on it, its an S4.