I run Borola XS 3" I/O mufflers with turn downs.
My downpipe splits in a home made Y to dual 3" pipes back to the mufflers.
At 1240 RWHP, power loss is below what the dyno could reliably resolve. The biggest issue is weight, since large steel pipes are heavy. I have no real idea what it all weighs, I'm just guessing 30-40 lbs?
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89 LX. 363, single turbo, Super Vic EFI, TFS high port heads by TEA, solid roller, glide. Holley HP EFI. (exact combo varies)