fcdrifter13

I have the stock turbos for my -re i know that they are HT10 and the an -rew are ht12s. Would the center CHARs out of a 20b the ht15s work in the manifolds as a slight upgrade that would offer comparible spool time?.

Also i have about 6 sets of n54 twins(oh the joys of once working for bmw) but i have no idea what size they are. I have the factory 13bna from my 86 that i was gonna play with over the winter because apparently my new home gets to about -20 a ton and i will be very bored. I kmow that the char can be changed with machine work to fit a td03 or td03 and all if the avalible info for those but no mention of stock specs. Even in our manuals at the shop there are no mention of specs or flow charts that i have seen