2nd Generation Specific (1986-1992) 1986-1992 Discussion including performance modifications and technical support sections.

diff s4 and s5 turbos

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Old Jan 12, 2007 | 10:09 AM
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backslider7's Avatar
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side ways is better
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From: dallas, tx
diff s4 and s5 turbos

i have a chance to get a freashly rebuilt turbo for 100 bucks but i need to now if its a s4 or s5 he does not no and i haved searched i was wandering you guys could give some pics or somthing very noticable about them to tell the diff
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Old Jan 12, 2007 | 10:13 AM
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Aaron Cake's Avatar
Engine, Not Motor
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From: London, Ontario, Canada
S5 turbo has a square exhaust flange (looks like a TO4 flange). S4 has an oddly shapped one.

That's the easiest way to tell.

The wastegate arm on the S5 is also bent, and the hotside is much larger physically due to the dual wastegate.
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