^^^^ok first of all the best gt30 series for ts is the gt3071r...why? refer to my previous post. the gt3576 also works well, reasons are mentioned in my prev post.
second of all going from a .63 ar to a .78 ts will not give any more boost onset response or throttle response, it will however give more mid range. Also twin scroll manifolds also use more bends are a bit more lengthy in general which affects boost responce
if you want twin scroll get another tial 38mm and copy the full race duel gate, otherwise keep your single gate and .63 and copy the bull horn full race one. It has a nice merge collector and will be easier to get right
second of all going from a .63 ar to a .78 ts will not give any more boost onset response or throttle response, it will however give more mid range. Also twin scroll manifolds also use more bends are a bit more lengthy in general which affects boost responce
if you want twin scroll get another tial 38mm and copy the full race duel gate, otherwise keep your single gate and .63 and copy the bull horn full race one. It has a nice merge collector and will be easier to get right