The problem with selecting a manifold is chosing one which suits you and your budget. Most people will only purchase one exhaust manifold for their car so cant really give opinion on which is best and the difference on how the engine feels/performs. Even then, that persons opinion may differ to the next person.
I suppose the power thread in the engine section helps a tad but even then there's lots of other contributing factors (different dyno, ambient temp, car mileage) which only means its a rough guide.
IMO the power increase differences between most of these manifolds is neglible anyway. I chose the DC sports for this reason - its got a good reputation with regards to performance and durability. If it means I lose 10bhp versus a toda/buddyclub (which I dont think it would) then so be it. I've gained performance over standard, its given me no problems and it sounds great - awesome for £400!! And I've saved £400 (or whatever it is) versus the toda/buddyclub
ETA Just to clarify, my options were Buddyclub, Toda or DC sports, so thats really what im commenting on :idea: