Hi guys, after some experience or advice... I have an 08 series 1 with a Jardine slip on oem air filter, exup off, sai set to 900 rpm. When I bought the bike it was running the 20421 tune (full arrow exhaust) but when it started cold, it would run erratically for a while ( 40 sec to a min) then run good. I bought all the tune ecu stuff and thought I'd try the 20420 tune (just a slip on). This seemed to help with the erratic idling when cold but has reduced my fuel efficiency by about 40ks out of a tank. I also get quite a bit of carbon build up around the exhaust tip. I will take it to a dyno within the next few months but for the time being what should I do? Replace the original tune or keep this one? Thanks in advance.