Wanted to update the general Steptoe mod thread with something I just tried. To recap I have a 2002 R1150GS Adv, Y-pipe + stock canister, K&N. Did the jumper mod to catless map a while back with good results for thousands of miles. However this summer while on a long ride, got some pinging again. Conditions were very hot, slow, stuck behind a truck for miles coming into Lizard Head pass south of Telluride (maybe 10-11k ft elevation). Needed to get on it to pass and got the worst pinging ever, felt like it was going to stall. Thought maybe it was gas, later filled the tank and got some more under similar conditions a few days later. We were riding with a Canadian fellow, and using hand signals and crude pantomime he was able to communicate that he used a Dynojet PCIII wideband to good results on his GSA back home (Hi Ian). So I kept that in mind and waited for one to show up on fBAy or Adv flea market. One did and I got it. There are only 2 maps available for the R1150GS. Stock and modded (for hot cams + porting + exhaust, not sure where they got this stuff). The stock map however is richer in places plus the wideband in the closed loop section takes it to 13.8 AFR, richer than stock. What I did was select the stock map, but kept the Steptoe jumper mod in place. So what the system is doing is taking the base jumper catless motronic map and running it a bit (or a lot) richer in places, but then in the closed loop section slightly richer with much better closed loop control from the wideband. Holy cow what a difference! Smoothness, power, TQ down low, etc. Just blew me away, like a completely different bike. Was not able to replicate ambient conditions for prior pinging but the change is obvious. Pretty clear even the catless jumper map was running a bit (or a lot) lean. All part throttle surging @ 3-4k RPM (which was getting annoying) just gone. Even the sound was different, more like liquid/fluid pump running instead of agricultural metallic. One thing that may have happened I don't know enough about how the motronic works though. I understand adaptation takes place and it may be over time it adapted away from the initial richer settings. The PCIII takes over the O2 sensor completely, the new wideband sensor output plugs directly into the PCIII and does not even talk to the motronic. On other bikes I have recently found out that earlier PCIII's where they recommended you run in open loop (disconnect O2 sensor completely) when doing that the ECU defaults to a mid-lean map. So now the procedure is to use a cat eliminator/simulator to fool the ecu into thinking a sensor is connected, and defaults to the true base open loop map (richer). Anyway the PCIII USB with wideband sensor has a plug for the old O2 sensor harness and I suspect it does this to defeat a default motronic adaption to no sensor. So perhaps the PCIII now sits on the base non-adapted jumper map, richens this up here and there, and runs a tight closed loop to 13.8 AFR in the closed loop section. Lots of room to adjust here, too. I can post up a pic/screenshot of the Dynojet software map if anyone is interested. Comments welcome, the above is some conjecture as to how the whole system works. Best part of this is I got the PCIII + wideband sensor for $150 shipped from a member here.