I'm late to the conversation, but here are a couple of comments.
1) For a collector with good transition & design, contact
Burns Stainless (yes, they also work in regular mild steel). Their collectors are a work of art and have great internal flow, without tubes crudely inserted.
Unfortunately,
this appears to be the smallest they normally offer. You'll need to call to see about a smaller collector. Nope, they ain't cheap!
2)
Quote:
Originally Posted by ksa8907
Ive seen these venturi tips on all the new duramax diesels.
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That (or a variation) tip is on all new diesel trucks. It's not for economy or power, but is for when trucks go in to "regen" to burn carbon out of their particulate filter. When doing so, the exhaust gets extremely hot, and the tip causes entrainment of cool air around the hot core flow, helping to prevent fires caused by the exhaust.