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A divided housing will increase spool-up but will increase back pressure. A .78 A/R housing is good for a 3.3 or 3.4ltr.. It's tight for a 3.8ltr. For a 3.8ltr I'd look at a larger turbine wheel.. The GT35R wheel is smaller than a K27-7200 turbine. When Porsche went to the 94 3.6 they went with the 7006 (turbine) which is 3/8" larger than the GT35R..
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