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I have the room for either.. Just wondering if the duals would spool faster with less turbo lag. I dont really see how tubing would be an issue. I mean the headers would be right to the fenders where they are cut out. Just trying to figure out what would be the best for my app..

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I am using the B/W S480 w/1.10 a/r turbine housing on a blow-through 411" B engine. On paper should be well into boost at 2800rpm. If there is a lag issue a "Sneeky Pete" with a 50 shot will take care of that.
As stated before, alot less parts and materials. The S480 is good to 1150hp and at a good price, around $900.