Quote:
Originally Posted by rxheaven
is this basically for newer cars and would this have no major improvements over the hfs3 on an 92 rx7
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There several improvements on the H4 over the H3. One in particular is the ability to balance the meth flow rate between boost and IDC. This allows you to add more meth in the mid-range.
Think of the H4 as the H6 (discontinued) replacement rather a newer H3.