SD vs MAF

[65 drop top]

That looks heavy.....is it just 3"?

I have done a dual filter like that with 4" aluminum, build one side that actually works and has the MAF in it and then Y the other side in as a dummy. No one knows, looks symmetrical, no retune required.

The tubes are stainless and the air boxes are mild steel, I think. It looks like it is 3" tubing to me, and then where they meet is 4". I could call the manufacturer to find out for sure.