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Author of "101 Projects"
Join Date: Jan 1995
Location: Rolling Hills Estates, CA
Posts: 27,056
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You can go either way, there's obviously some overlap between the 46s and the 40s. If you jet the 46s down, they will work fine, if you jet the 40s up they will work fine too. On 3.2 and larger, it's a general rule of thumb that you should go with the 46s. They are more than ample for the increased airflow...
-Wayne
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