Mines Tuning in Japan recently also took a few HR15DE's and started giving them some proper tuning, catalogue bellow shows off their current offerings for the K13 Nismo S.
link:
http://www.mines-wave.com/JP/CATALOG...SMO_S_K13.html
P.s the owner of the demo car on the pictures is a friend of mine from another hobby, he shared me a few secrets Mines is planning for the car, e.g individual camshafts for sale etc, and also the VX-ROM from Mines for their tuned E12 Note Nismo S is also available for purchase since that car uses an HR16DE (Nismo tuned, dedicated cams, valve springs, and weighted crankshaft "balanced" producing about 140hp.