the deal with the indy was bad quality control...all the runners have to be port matched...thats how far off the quality control on some/most of them were, otherwise I'd say its a pretty good manifold...as for how far back I cut it...I cut it just after the 90 myself, cut it with as much room as possible for them to get behind it and weld the flange(which you will have to cutt off as well) back on