I replaced 2 clutches from a previous car in a 1 month timeframe. Stock was giving up so I ordered an aftermarket heavy duty clutch. I recall it was a Sunday and when installing it, I forgot to order the throw out bearing and didn't resurface the flywheel and all the shops were closed and the ones that were open didn't have em in stock. Long story short, after install everything seemed fine except after a week, a lot of slippage. Disassembled everything to find out that the new clutch had burn marks, the flywheel was warped and the throw out bearing failed do to the heavy duty clutch. I had to replace the clutch, get a new flywheel and throw out bearing, installed again... And everything was fine afterwards except my wallet.