Originally Posted by cannga

Thanks for the valuable input; what you describe is exactly what I am hearing. A resonance at 840 rpm that is both louder and higher pitched than the normal low frequency rumbling of the car that I love so much. And as you mentioned, it goes away at 950 or 1000. Although the volume is not that loud, being a higher pitched resonance, it is bothersome and intrusive.

Let's see what Todd have to say, but I do not think you should go up on the idle rpm because, for one, everyone on the forum is reporting 750 rpm at idle. I mean, even though 1000 idle rpm may solve the problem, it seems to be just fixing the symptom and not the root cause.

Todd is working with Mike/RSS to help me with this problem. I will be at RSS this Friday for a re-flash, around 3:30-4 pm or so. If you have time and are interested, come by and we could compare notes?
Thanks again.

Originally Posted by bli8

Since the Sport mode "drones" more than Regular mode without a change in the idel RPM, there must be something else in the tune that changes this characteristic. Don't know what this is (timing, spark, or whatever) but can this whatever be adjusted around the idle RPM range to rid the "drone".I was told the Milltek and Cargraphic mufflers are of similar design and that's why we are the ones that are experiencing the same issue. I won't be able to make it to Stuttgart on Friday but if you go to Cars and Coffee Saturday, we can meet up and compare notes. BTW I compare exhaust notes w/ TTTurbo's Milltek and his didn't have the drone at all. His has a tuen from a different tuner though.

Originally Posted by bli8

...but if you go to Cars and Coffee Saturday, we can meet up and compare notes. BTW I compare exhaust notes w/ TTTurbo's Milltek and his didn't have the drone at all. His has a tuen from a different tuner though.