I have SLP LM1's, the bbk off road x pipe is not a "true" pipe and i used to have it. It caused a lot of drone on the highway and it was so obnoxious, crappy fitment and my ears would ring for hours if i was driving non-stop for more than 45 minutes. I was pulled over on the NJ turnpike by a trooper hidden in the woods and he said my sh*t was too loud. It was a 50/50 toss up on who liked and disliked the sound. I have a Pypes catted x on now and its very mellow, I can barely hear even hear it in the car unless Im WOT. I just bought an off road pypes x-pipe from a member here havent put it on yet to see how it sounds. Quality on those pypes is decent especially for the price, only downside are the flanges that bolt to the headers, they are very thin and easy to bend of you torqure down on the bolts really hard like I did. I dont like exhaust leaks lol