So I did a before and after sound meter test with and without dynamat in the trunk and I will post the results later.
I did not record in that range but driving the car now with the dynamat feels and sounds different. It may be my imagination but a lot of the drone is not being transferred into the cabin. I do hear the exhaust at throttle as I should but I don't get that loud humming at cruising speed as I used to.Excellent work. I find that the major problem with cabin drone noise is between 2000 to 3000 RPM (around the shift point), not necessarily at idle or cruising speed. By any chance did you record any information in that RPM range? Also, the droning tends to be in the low frequency range which is not the frequencies that
I'm actually finding that I don't have the radio/music on nearly as loud as I used to before I got this exhaust installed because I actually want to hear how loud it is...I also used to only drive with the sunroof cracked open if it's nice outside, but now i'm cracking it and both windows to hear the exhaust more...I have no issues with the drone either. If I'm on the highway, the radio is on and drowns it out anyways.
I have spoken with multiple people on the FB group as well as some who have purchased from Gwinnett, and the general consensus is these sport exhausts with mufflers have been very well received. Drone has been cited as a factor, of course, but not anywhere to the degree that you and AllMineRS400 are describing.Yes, cruising and idling have never been the problem. It is that shift point area between 2000-3000 RPM that is especially annoying. I have gone from stock exhaust to Sport Exhaust, back to stock exhaust (twice), to Sport Exhaust with mufflers, and back to the stock exhaust. Another post mentioned that there was one or two people in this forum who disliked the sport muffled version. I would tend to think there are more than a few people. I have had high performance cars in the past with headers, custom exhausts, low restriction mufflers, but the exhaust noise was at the back of the car, not in the passenger cabin. I suggest that you visit the Flowmaster website. They offer a wide range of mufflers and rate them according to aggressiveness of exterior sound level but also interior resonance. There must be a reason why they do this. I think the answer is obvious. Unfortunately they don't have anything to fix the Q60 drone.
Flowmaster Street Mufflers - comes in Stainless Steel or Aluminized with choice of mild, moderate, aggressive, and very aggressive sound.
Hey Prestige, the dynamat product I purchased is this one Dynamat 19405 Dynamat Xtreme Trunk Kit Five 18" x 32" (457mm x 812mm) Panels 69103194054 | eBay.In regards to your dynamat installation, would you mind telling us how much you've used so far and are you using a roller to apply it or is it all just by hand?
That's pretty cool. It retards the vibration of the cymbal, but I wonder if it is as effective at keeping sound from passing through it.Has anyone thought about using the Boom Mat Spray? I saw a company video where they tested a strip on a drum cymbal and the results were pretty impressive.
Seems like you can get better coverage, albeit more permanent
I mean, you don't have to use deadening mats at all, a lot of us with this exhaust are very happy with it and are not sharing the same drone 'issue' that others are...I sound like a broken record saying that but people keep willfully ignoring that it's a very subjective thing...i'm about 600 miles in with these sport exhausts w/ mufflers and I honestly couldn't be happier. I'd have ditched them on like Day 2 when I got them installed weeks ago because my girlfriend would have complained about them endlessly if there were annoying/unbearable drone issues, but she has had no issues with this exhaust at all. On the contrary, if these exhausts got any quieter i'd probably be complaining as I love how aggressive it sounds.Its a shame they can't come up with an exhaust similar to the original G35. The sound was subtle but nice. Having to go through the trouble to use sound deadening mats is ridiculous.