Yep, I beam rods are desinged for high RPM (8K usually) H beams are designed for higher HP lower RPM engines (7K usually). With the 05 I doubt you will turn over 7K, so i would go H beam...FWI 03-04 cobras are H beam and the red line starts at 6500, meaning the engine can be damaged at anywhere over 6500. But again, depends on what you want, if you dont plan on sending 17+ PSI through it, I beams would be great as you could run it to 7500RPM, and with a centri it would just make more and more power.