You could feasibly use one can and reroute both lines, but the Single-Valve can's hoses are all pre-cut, so you would need to add hosing to the system and then do splicing and custom work to get it to function properly, not to mention you'll miss out getting the full effect of the CSS drawing vacuum at WOT. Still, it's doable, technically. While just plopping a pair of breathers would get you more less the same result, that set up is most definitely not street legal, may not pass emissions in certain areas, makes your engine bay smell to high heaven, and at the rate you'll go through breather filters, you'd probably just save money in the long run by installing a complete catch can.