1) Good: finally 321SS manifolds, as they should be - bravo. 2) Mediocre: big turbos plus huge FMIC - huge lag (plus overheating) 3) Impartial: what size for downpipes? 304SS? A properly-designed divorced wastegate (7" or more downstream) would make for a nice compliment. 4) Observation: Don't you want to cut the manifolds mount to alleviate the thermal stresses?