A while ago I put a 2005 STi cluster into my 05 WRX. I have noticed that the speedo is slightly off. I double checked via the accessport and my speed seems to be about 5-7mph too fast.

I wanted to know if there is a problem with the cluster, or if the STi cluster is not taking into consideration my stock 16inch wheels. Will this be fixed if I upgrade to a 17inch wheels?

Please help