Am in the midst of purchasing a header for an IT spec '89 CRX Si. Stories are conflicting concerning whether or not the D series motors will benefit from a 4-1 like the B series ? Is the top end gain on the 4-1 worth the relative loss in midrange compared with a 4-2-1 setup? Preference on brand ? Had planned on running a 2.5" pipe from the header back.

Thank you,

Robert J.

[This message has been edited by Mr. Noodles (edited January 17, 2004).]