Fair enough. BUT why do our cars respond so well to larger front pipes, cats and catbacks?
Wouldn't it be better to have 2 3 inch dumps going into a matched twin 3 inch front pipes rather than out of turbo, into something larger then into something larger again.
Perhaps on a 430rwkw+ car this is where the bigger dumps count? As Ash said at 350 or so the dumps are not as restriction .... YET