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Message: [QUOTE="NorcalOBS, post: 953981, member: 14612"] Ok, thank you so much for responding, I need to figure this out because there are larger compressor options I can install on this thing. The main ones being a larger wheel with a 62mm inducer and matching housing, or a 64mm set that are sold to the 6.7 Cummins market as stock turbo upgrades. I thought this thing was gonna be past its peak efficiency in my motor however I read some Cummins guys claiming well over 400hp with the hx40??? Thought I might get away with it with my lower power goals. However, I am well aware of I want low temps I need to let the air flow. Anyways, I am having trouble getting any real specs on the bigger compressors. they are advertised as the 62mm being for 350-425hp and the 64mm being for 450-525hp ??? Whatever, I know those numbers mean nothing. I am guessing since the d66 it's the go to obs turbo I should be looking at the 64mm set but I am just making a clueless guess at this point. [/QUOTE]

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