I ran V-stacks on mine, the problem with those cleaners is the foam can/will catch fire if a flame hits it, another issue is the foam starts falling apart & going down the engine. I'd install some household metal screen in-between the 2 rings, i'm sure they have a mesh type pattern like a grill so it'll hold the screen in place. For street driving, i'd run 2 round cleaners with K&N type filters.