i think pretty much any 3" free flowing exhaust from the turbo-back w/ straight piping, and catless would work good. unless there are actual dyno comparisons to compare one brand to another, its all just speculation imo.
as for weight savings on a Ti exhaust, is the weight savings really significant enough to justify the premium. for the sake of function and practicality, i really doubt it.
on a side note, arn't most aftermarket downpipes not fully 3"? IIRC they all have 2.75" or 2.5" bottleneck. that's prob something else to look into.
