A PX600 (Component # C6004) filter from Pipercross can fitted for the 20v throttles by having an adapter, we have these Pipercross adapters, ITG filter adapters (only match shorter stacks) plus the matching velocity stacks offered via our retail outlet. I took the original silvertop manifold and hacked the crap https://grahamy430bbb8.topbloghub.com/profile