Absolutely trust Mace gear, more wanted to know if these are as good as MSD? They are quite a bit cheaper. On the V6 type ignition MSD or equivalent seem to be a minor upgrade over stock. Normally I stay away from MSD as on a few different cars and makes they are known to cause problems. But I have it on good advice from a JC mod that the V6 ignition can be upgraded because of the type of ignition it is. I checked the site but couldn't find reviews on coils? Maybe I don't know the site well enough to know where to look, not sure?