[ajm55]

I have a 2103 Comp with 80k kms under its belt. Mods are CSF charge coolers, PG intakes, downpipes, rear diff brace, XHP gearbox tune and BPM stage 2 tune. The car is in very good shape and has been meticulously maintained by me over the years.

I have no plans to sell the car in the foreseeable future and good sense dictates that I reinforce the bottom end to avoid bending a rod or melting a piston. I am way out of my depth in this area and would appreciate some input on the available and most viable options from those who have already gone this route. Alternatively, perhaps someone can recommend a reliable vendor to whom I can address my queries.

I am considering Carrillo rods and pistons, and my research indicates that I should be looking at the following options:

1) CP Forged Piston Set, BMW S63 Alusil, Pro-Xtreme (CP-FPS-S63-XT)

2) CP-Carrillo Connecting Rod Set, BMW N63/S63 Pro-Xtreme (CAR-CRS-S63-XTT)

Is my thinking correct?

Regarding the Pistons:

- As we are not altering the stock bore, do I opt for the 89 mm bore size
(which i assume is the standard bore size) rather than the 89.25mm bore
size pistons?

- I see that there are several options on compression ratio, namely 9.5:1,
10:1, 10.5:1 and 11:1. If I do not plan to run more than 26 psi of boost,
do I stick with the stock compression ratio and, if so, what is that ratio?

- Is it advisable to go with the heavy-duty wrist pin?

Regarding the rods:

- I see that tapered and non-tapered are options. I gather that tapered is
compatible with the OEM piston while non-tapered is not. Is tapered also
compatible with the CP piston referred to above? If not, then obviously I
must order non-tapered. However, if compatible, then would it not make sense to order
tapered to accommodate me in the unlikely event that at some point in the
future I need to substitute the CP Pistons with OEM pistons?

Is it advisable to also get the ARP Head Stud Kit, (BMW S63ARP-HSK-S63-S)?

Should I fit a new oil pump?

Any other advice / suggestions?