marcos estoy dando un rulo por internet, por la pagina de miltek me puedes explicar esto:

1. LARGE-BORE DOWNPIPE
Consists of: Tailpipe Style
Large-Bore Downpipe and Catalyst Replacement


Pipe Diameter: 2.50" (63.50mm)
Locate your nearest Milltek Sport stockist





2. HI-FLOW SPORTS CAT AND DOWNPIPE - Must be fitted with the Milltek Sport cat-back system
Consists of: Tailpipe Style
Hi-flow Cat & Downpipe


Pipe Diameter: 2.50" (63.50mm)

El primero es la dowpipe con supresor de catalizador? y el segundo con catalizador de alto flujo?