This is an old post but gurgling is nothing. And my stock n55 had a huge backfire tonight going hard up "the snake". When i got to the area where ppl park and hang out, they were going shits and giggles nuts over it. I was surprised and thought i hit a branch on the undercarriage at first but apparently it echoed all the way up to the spectators. Nice.
Monkey see monkey do...I drive a poseur modified sedan.