No not at all, by restricted exhaust I mean where the benefits of overlap are negated by backpressure like from manifolds or tiny headers. Combos like that need wider spreads, later ICL's and the intake tract need s to pretty much 'fend for itself'

For the 430 the TTI's and a nice 3.5 to 3 dual system would be perfect, x pipe would be a plus but not a necessity IMO.