[Bobiam]

2010 turbo engine. Stage 2. No other engine mods. No changes in 30,000 mi. 62,000 miles total.

Driving along today, all of a sudden I hear a medium roar at moderate acceleration. Expressway cruising almost normally quiet. This went on for 5 miles or so while I kept testing to listen and determine the location. It was definitely coming from the engine area or as far back as midway. Then as fast as it started, it stopped!!!!!! I just know it's going to do it again.

Ideas please....

 

[bigboyscottyb]

bumping this idea up, I have just started to experience a similar noise with my turbo diesel engine

2012 model 40,000kms, my11 wrx cat back exhaust

Noise only comes on between 1000rpm and 2000rpm