Been using PowerMaster for as long as I can remember. Used it on my stock 455, and continued using it with my modified 455. Originally swapped out after too many hard starts with my OEM and long branch headers. Did shields, wraps etc. Not needed with my PowerMaster. Only had to change it once, after getting filled with oil from a bit of a engine issue (LOL). Fact is, it seems in general these days that several brands are good. I'd stick with a brand name, but that's just an opinion.
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