Quote:
Originally Posted by Hawk77FT
CFm - after my intake manifold extrude honing.
Runner before after
1. 431 472
2. 433 474
3. 430 471
4. 427 468
Hope this helps
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I'm actually quite impressed with the delta between the factory runners. Quite a well made unit, as one would assume something N/A at over 100hp/L would need to be.