Note sure what the later versions of the BIG GUN are like, but the earlier versions were good for desert riding and that was about it. We had 2 seperate systems, 1 fitted to a 00 FE501 and the other to a 00 FC600 and they were both beyond the noise level of anything that i had heard of before. In defense i do understand that the later versions have tuneable end caps much like some of the FMF & Pro Circuit systems.
In the early days, ie; 98 thru 00, Big Gun were the only manafacturer doing pipes and mufflers for the Berg so they had a captive audience.