PROBLEM OMEGA B 2.0 16V Caravan

Top speed (PROBLEM) OMEGA B 2.0 16V Caravan hello, I have the following problem I wanted to test today the top speed of my Omegas and drove on the highway. I gave neat stuff and saw that the speedometer needle was no longer in at 185-190 Kmh. THAT CANN’T BE IN THE PAPERS HE SHOULD SOLL 202 KMH run there is a difference of 12 KMH. Actually he should run a little faster I have a sports exhaust system from Bastuck from Katdra N made of stainless steel, a K&N air filter and Brisk tuning spark plugs. So I have around 150 Ps available. PLEASE HELFT ME WORAN CAN YOU LOVE???????????? MY VEHICLE: Opel Omega B 2.0 16V Caravan Edition 100 Year of manufacture:1/99 225/55 R16 94H Tyres by Falken Sports exhaust system by Bastuck from Kat (stainless steel) K&N Air filter Brisk Tuning ignition plugs