I have 1st Gen B16A w/USDM Integra S80 transmission and ACT stage 3 clutch. I have this weird issue sometimes when starting in 1st gear and at low rpm in other gears. The car starts out sounding like a lawnmower and very choppy then it all the sudden switches over and sounds normal like nothing is wrong. It is not the normal bogging when in to high of a gear at low rpm either. That has been replaced with this two stroke sounding grunt. I dont know what could be wrong.