Front and Rear rotor housings
#1
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Front and Rear rotor housings
What are the differences in front and rear rotor housings?? I have one that has no stamp on it (or it's impossible for me to see).
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#4
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There is a hole that I think is for air injection that is drilled into the gap around the exhaust sleeve. It is drilled up from the bottom and is drilled to the back of the front housing and the front of the back housing. That is why they're stamped. I think there are some other easy to fix differences like turbo coolant feed
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After much searching on both the forum and on actual housings. I found the hole for the air injection difference and it seems that it only affects emissions and not functionality. You could run a motor with the housings swapped and you wouldn't notice a difference. That is until you got to the emissions place and they failed you. Atleast that is the way it is on an S4 engine. Not too sure about S5 or S6...
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