Just out of curiosity where did you come across this down pipe ? Houston has been out of business for a while and I thought red Armstrong stopped reproducing them as well.
Could it be a Terry Houston style down pipe instead of real Terry Houston pipe? Just asking questions because of potential interest.
I got it from a local guy who said it was a thdp. I questioned it myself so I put it on the Facebook groups to double check and a few respected buick guys agreed it was a terry pipe. They said if it wasn't then the quality looks just the same.