Supertech 

CP Pistons Carillo

Wiseco 

Wössner

 I highly recommend buying a gear reduction starter.

Denso 280-0156 (OE #: 28100-15150) Fits 4AGE with T50 Transmission

It has 1.4KW instead of OEM 0.8 KW

Martelius AE86 Group A manifold       4-2-1  38 -> 44,5-50,8mm  <180HP

Martelius AE86 Group A XL manifold  4-2-1  41,5 -> 48 -> 57mm <215HP

Martelius AE86 R1 manifold                  4-2-1  41.5 -> 50.8 -> 63.5  (to 240HP?)

TODA  4-2-1 V.2                                        4-2-1   45-> 50-> 60

Its important to use the right size Injectors for your build. Bigger is not always better.

You will need to know the spray patten, impedance, pressure, size,deadtime etc before purchasing new ones.

Stock Bigport has ~182cc Injectors

Stock Smallport has 250cc Injectors

For my first build i used 195500-4430 Injectors. 

They have the same physical size as Stock Injectors and have a great spray pattern.

BUT there is some conflicting info on the web.

They are RX8 Injectors listed as 350cc, BUT a lot of sites show the same part number listed as 240cc!

My Injectors actually measured at exactly 280cc/min @ 3 Bar (43,5PSI)

Now im using Bosch EV14 Injectors. Very cheap and the best you can get. 
Dont buy modified injectors from tuning websites. There is no benefit from modyfiing old ones. New ones are the same cost and better in every way.

Note: Look at the datasheet to make sure the spray angle and orientation is right for your engine.
Otherwise you will have problems in the lower rpm and or idle.