Originally Posted by willwren
I thought the Dorman intakes were already sleeved? Communication seems to be very lacking in this topic. Firebuick, you need to be alot more clear about what you're trying to point out or ask.
No, Dorman uppers are not sleeved. That is why I recommend APN. That is also why I designed the shielded stovepipes. They can be used with a new Dorman upper to give almost as good a result as the APN by just installing them into the LIM. I think that Dorman figures the big gap they provide with their .510" stovepipes (about .135") is good enough. But without a sleeve, they are not as good as APN.
Summary: APN: metal sleeved UIM, 1) reduced diameter stovepipe with 3/4" base
.....................Dorman: no sleeve UIM, 2) reduced diameter stovepipes 3/4" and 5/8" bases