new headers

If the current headers are new, it is not that difficult to massage the dents out, or replace the crushed parts, which is a lot less money than new TTIs. Don't think that TTIs won't need "fitting"; That seldom happens. You're still gonna have at least two difficult areas and the engine is not likely to end up in the stock location.
However, that above the steering design, for me, was well worth the struggle. I can now blast over anything with impunity. Well, not quite; I had to install a skidplate to protect my Milodon roadrace pan. Now I can blast....