i currently only have a HMF slip on, but i just finished doing stage 2 hot cams, 13.5:1 weisco piston, ported head and green wire by pass. will getting a header pipe help or is stock ok?

The head pipe willl help. Hmf head pipe or even HRC.

i cant get just a header pipe for hmf, i would have to get a complete system which is 485 on top of the 230 for the exicting slip on i already got. Can u get just the hrc header without buying the power up kit. Because i have a pipe bender for doing car exhaust so i can flare to make fit slip on if needed.

Did you actually call hmf because I thought they did sell the headpipe seperately?