snap said:

http://maksinjection.com/?product=bosch-0280-155-746-19-injectors-set-of-6

There are a few different injectors that would, I have run about 7 different types of injectors and for an M20 with chip tune, these are the best.

 maksinjection can be mediocre in communication or product quality. ive dealt with them on 4 or so occasions. I have had injectors they have serviced that were stuck open. They replaced them but at times they were difficult to contact. 

 Ultimately they are cheap and worth the gamble.

 Otherwise search for Bosch 0280 155 746 injectors on Ebay and see if you can find a matched set from a reputable shop like injector-rehab.com or others

 This is all a good upgrade but you will get used to the power pretty shortly and need more. 

Thanks @snap . Agreed on the power problem, at some point I switch to the E39 M5 when speed, handling, and power are craved. That being said the E30 is still my most entertaining car.

There are a few different injectors that would, I have run about 7 different types of injectors and for an M20 with chip tune, these are the best.

maksinjection can be mediocre in communication or product quality. ive dealt with them on 4 or so occasions. I have had injectors they have serviced that were stuck open. They replaced them but at times they were difficult to contact. 

Ultimately they are cheap and worth the gamble.

Otherwise search for Bosch 0280 155 746 injectors on Ebay and see if you can find a matched set from a reputable shop like injector-rehab.com or others

This is all a good upgrade but you will get used to the power pretty shortly and need more.