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Smog will be fine as long as you have the cat. Both cars have A3’s, just different intake. You’ll have a CEL for the intake runners unless you use your RSX manifold.
 

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That depends on how you look at it lol.

Realistically, the PRB manifold is the better of the two. You'll make more power, but you'll lose the extra torque down low. Tuning would be required to make that extra power, though.
 
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