I don’t recall the engine holding rpms, but I can’t say for certain it wasn’t doing that. Yeah, at times it felt like there was an exhaust issue, and even the dealer said that might be the problem (just their guess when I described the symptoms).By chance when you were having these issues did the engine hold the rpms while pressing the clutch over 2000 rpms. Also did it feel like there was a blockage in the exhaust with the lag in acceleration. trying to see if I have the same issue going on. Definitely have the loud engine noise and vibration in pedal and shifter.