1) there seem sto be a minor interference problem on the bolt of one of the V-band clamps -- people have been bending this bolt to make it fit.
2) I think it was the TA headers -- one buyer's headers had some really atrocious weld quality where tubes attached to flange. I'm pretty sure it was replaced (by Nick Micale??), but it was disappointing to learn of that problem on nearly $1000 headers ...