How about something like this? It's a 4" no-oil AEM filter with a built in velocity stack that necks down to 3.5" for an LS1 MAF (or omit the MAF for SD, the pipe is long enough) Then necks down to 3" for the turbo. All brand new with SS T-bolt clams and multi-ply silicone boost hoses.
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I built this for my car a couple months ago and while installing it, I decided to pull the engine so I could upgrade to some of my forged pistons.