RE: need info on tren please
Ester plays a role in detection - yes, but minimal.
Tren acetate vs tren enanthate.
Half life of tren enanthate is 5 days roughly. Tren acetate 1 day. In the body what happens to the tren? Enzymes removed the esters from the active compound leaving the parent compound to work on the body. Roughly 5 half-lives from last injection and there is no more compound left - so in tren enanthate's case 25-30 days. Detection of trenbolone and/or metabolites is based upon the parent compound NOT the ester. Thus 5months + 25-30 days after last tren enanthate injection there should be none dected. So in essence only really 20 days longer than the acetate version for detection times.
Just because something is a deriviative of something else doesn't give it the same properties. Look at L and D glucose - identical molecules apart from the orientation of 1 OH group - one your body can digest easily and is essential for energy, the other your body cannot break down at all, and goes straight through you (eg. cellulose).
The same is true of compounds. Add a methyl group somewhere, change the orientation of a group, and you change the properties. You change what metabolites the compound can be broken down into, thus you change things like detection time.