- Genesis Model Type
- No Genesis Yet!
That's exactly it as far as I understand! In addition to that, some cars utilize this to help spool up the turbos a little quicker. Evidently combustion occurring in the turbo manifold still increases pressure and spools that exhaust turbine even more.My Yamaha FJR 1300 motorcycle makes the same sound, but only when cold. I've been told that its due to the rich fuel/air mixture provided by the ECM for a cold engine and some of the unburnt fuel actually ignites in the muffler system instead of the cylinders upon deceleration.