sockeyerun
Test Dummy
How much difference is there between a straight 45 deg. helix and a 47- 41 are they close or is there a big difference. I have recently added SLP pipes to my 7MM and set it up to their specs. except they recommend a 45 straight. I have however tried a Dalton 47-41. It seems to pull hard through the range and is peaking at 8900 rpms, which is what they say to run them at. Of course I have all the other stock straight helixs except a 45. Are these close or not? Thanks guys, Soc