Didn't ask for any extra (didn't really think about it either) since I know most run a little large. It was a little close on the edges, but I still had some to trim. Probably about 1-1.5" extra I took off. I took it out of the box the day I got it and let it sit around for a few days (waiting on the weekend anyway) to let it rebound a little into the formed shape. Picked the warmest day I was going to get (made it into the 60's) and set it on the driveway while I pulled the old stuff out to get some sun on it to heat it up. I knew going in my new tunnel would mess with things some, but overall it's not bad.
Tunnel design has a lot to do with it. I took out a 4 speed hump that was put in perhaps less than professionally, so I had a little more gap to fill with my new tunnel. I have pretty much no metal working tools aside from a cutoff wheel and a body saw. Formed most of my piece with my leg and hands, so it's even less professional than what I took out. Leaves some good room around the trans though, so I figured the carpet would be a little sloppy. The footpad looks like it's just creeping up the side of the tunnel a bit, which I sort of figured it might since the tunnel is taller. The back where the two pieces overlap between the seats isn't the snuggest fit (don't have it pulled tight to the floor), but it actually looks better kind of loose. My tunnel has to stay pretty tall for the shifter then angles down pretty sharp right behind it, so the carpet really isn't formed for that. A little heat and steam might help to conform it, but I'm just letting it ride for now. A console or bench side would hide most of my issues.
