[Rare Iron]

I've got a customer here locally that has bought several sets of my mufflers & one of his cars is pretty high HP - like over 600. He thought a larger flowpath like 3.5" would give him some extra punch (I can only make mine with cores as big as 3"), so he went with the Howe 3.5" core mufflers.

First off, they were so loud, he could not stand to drive the car any distance. Secondly & most important, he did not gain any HP. At the flow rate of my 3" Cobrapacks, dual exhaust with them will support approx. 1450 loss-free HP. The extra diameter was of no benefit. That would go the same for any 3" flowpath muffler with a similar core design.