I have an 07 civic si sedan 50k miles, and I recently have a horrendous time when it comes to shifting. I swapped out the stock clutch and flywheel about a year ago, and replaced them with the ACT Heavy Duty Clutch and ACT Lightweight Flywheel. Now down to the problem. I can't even shift into reverse without grinding, so i have to preshift it into reverse before i start the engine. :facepalm: Every shift after the tranny starts warming up, is almost impossible to get the gear to lock it, so I came down to the assumption that the clutch isn't disengaging? I took it into the shop and they said i was getting full pedal, but it indeed wasn't disengaging. However, before I buy a new clutch :facepalm: like they recommend, I thought I would run it by you all before I start dumping that kind of money. Any suggestions?