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AR numbers are .30 (where the exhaust gasses enter) and .48 was on the compressor side (i.e the bit that looks like a snail shell) does that sound more normal?
Yeah my one is off a 2.7 diesel they have real small exhaust entry thingy's like 1 inch :P but the dump is like 2.5inch there made to give diesels more take off as they have none hence the small .ar