You will get 2 or 4 pcs. original injectors, reconditioned and matched.
Your install the valves in the bike and ...
IMPORTANT:
After installation you will send back the box with your used injectors and the tools within a week, or so. 

Advantage: job done in one got, no downtime for the bike.
Your old injectors are refurbished by us and recycled.

Result, Bike (in this regard) will most likely be better than new because BMW hasn't matched nozzles the nozzles to our specs. at the factory.
Spray pattern and throughput are as the developers would then have liked it in the production.
No tuning, but maintenance and optimization.
Note:

O-rings are new, there are some in addition in the box to cover for the possible event of damage during installation.
Please make sure to order the correct type: 

13617677017 as used in : 

• K40 (K 1200 S, K 1300 S)   (04/2003 — 04/2015)
• K43 (K 1200 R, Sport, K 1300 R)   (03/2004 — 04/2015)
• K44 (K 1200 GT, K 1300 GT)   (11/2004 — 10/2010)
• K42 (HP4)   (09/2011 — 07/2014)
• K46 (S 1000 RR)   (09/2008 — 04/2015)
• K47 (S 1000 R)   (02/2013 — 04/2015)
• K49 (S 1000 XR)   (05/2014 — 04/2015)
• K18 (C 600 Sport)   (02/2011 — 04/2015)
• K19 (C 650 GT)   (01/2011 — 04/2015)