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If you are getting boost creep I would definitly go with the manifold and 40mm flange. I believe the 38 and 40mm flanges are different. You can always go with the 40mm for extra insurance but not 100% necessary with a 16G. I personally have a Big 16G EVO 3 ported and clipped and it creeps like a mother. I am upgrading bigger in a few weeks and will be using the manifold w/ 40mm flange. If purchasing a large o2 housing and manifold w/o an external wastegate might actually bring on creep if you do not have it already. The idea is to slow down the flow or get rid of it through a larger opening (bigger gate) to minimize or prevent creep. If you wanted the manifold with 40mm flange it is $560 shipped. Retails for $599 and retail is what seems most people are selling them for. If you find it cheaper, let me know because I try to beat every price by competitors. If you wanted the regular tubular manifold it is $460 shipped. Retail is $499
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