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i have a good thing for the second oem parts
***S4 vs. S5 Compatibility Guide***
The following are items that are not swappable between generations. Or advantages to swapping a part.
Engine and Components
-ECUs: Ecus are different between years and models. ECU code listing is listed above under Engine Controls.
-MAF sensors: Quasi Swappable. They are of different design, and swapping requires changing the connector as well. Advantages are subjectional. The S5 version takes less space.
-Engine (complete): The S5 engines were higher compression motors and are not a direct swap.
-NA Manifolds: Swappable with modification. VDI system must be disconnected or modified to operate.
-MOP: No. S4 are mechanical. S5 are electrical.
-Alternator: No, for one major reason, they changed the plug design for the alt. which is the same as the FD. The S5 alt is a better unit and upgrading to a FD alternator is a good idea for both the S4 and S5. But requires rewiring for S4. This must be done correctly, otherwise you will damage the diodes inside the alternator.
-Turbocharger: Sorta. The S4 and S5 have some fundamental differences which make it a little bit of extra work inorder to get to operate correctly. The S4 model uses a twin-scroll system that has a flapper valve inside in the exhaust manifold feeding the turbo. This directs exhaust gas flow to keep the turbo ready to spool. The s5 uses a different method, which at this time, i do not recall.
Engine Parts
-Housings: There are a few differences:
1. For the Turbo Housings, the S5 rear housing has a threaded hole for the knock sensor. This is on the intermediate plate for the S4 models.
2. The placement of the spark plug holes is different between the S4 and S5 housings.
-Rotors: The S5 rotors have a higher compression ratio and lower weight than the s4 rotors.
S4 13b 6PI: 9.4:1 compression ratio ~10lbs
S5 13b 6PI: 9.7:1 compression ratio ~9.5lbs
S4 13b Turbo: 8.5:1 compression ratio ~10lbs
S5 13b Turbo: 9.0:1 compression ratio ~9.5lbs
Suspension
-Rear Sway Bar Links: S5 models use plastic ones, S4's use metal. A good idea is to upgrade to the metal ones. Or buy aftermarket from Racing Beat.
-AAS(Auto Adjusting Suspension): Requires all controls to be swapped as well. Can only use factory struts. Not worth the time for the results.
Interior and Body Components
-The Stereo Surround: S5, made from rubber, doesnt crack like the S4 models.
-Idiot Lights and Cover Piece: Not swappble. Different Dimensions.
-Tail Lights: Yes, but putting S5 lights onto a S4 requires very minor alterations to make them fit.
-Gauge cluster: the S5 models have a different RPM limit (s5's have a redline of 9k)
-All body panels, spoliers, and related are interchangeable.
-All interior compnonets unless otherwise stated should be interchangeable.
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