Hey everyone. i'm thinking that all 13b s4-s5 rear side housings are the same.. am i wrong? i can get one from an n/a and put it on a turbo engine.

 

Nope, NAs are 6 port, and Turbos are 4.

Turbo rear rons have one port on them, and NA rear irons have 2 smaller ports on them.

Here's an example of a 6 port, I cant seem to find a quick pic of a 4 port.

 

oh my what a hardcore brain lapse.. smacks himself in the head.. i knew that

 

S4 and S5 rear irons are also different.

Different fresh air feed passages and larger casting on the S5's on the upper dowel pin.

 

well if anyone has a s4 t2 rear plate i need it..thanks

 

There are actually 3 or 4 variances in both NA and turbo 2nd gen rear irons.

The series 4 started off with a small casting by the upper dowel, and a small diameter hole for the temp sensor probe. In mid 88 they seem to have switched to a larger hole for the temp sensor probe, and a larger probe. I have even seen a few late 88's with the reinforcement by the upper dowel.

Series 5, was sort of pot luck. All of them had the larger hole for temp sensor. Some of them had the same casting at the upper dowel as s4. A few of them had a small reinforcement between there and the oil filter pedestal. An even fewer of them had a large casting around the upper dowel (same size as FD) plus the reinforcement.

No, this is not just a jspec/aspec difference, as the jspecs I've seen were half and half too.

The good news is that apparently all the remans have been coming with the biggest, strongest, latest casting/reinforcement.

This pattern applies both to NA and turbo irons, though there is the obvious port configuration difference between them.