120MPH isn't fast enough

Turns out my Blitz Speed Jumper for my Aristo V300 car (otherwise known as a Lexus GS to others) is incompatible. Having bought it 3 years ago, I can't pursue a refund. It looks like it'll end up on Ebay.

So I'm stuck at 120mph speed limit...the car can do 175mph. Was embarrassed by a 2004 model BMW M3 convertible last week which had no more power but pushed ahead of me to 150MPH+, therefore prompting my action to figure out the fitting of the speed jumper (poor instructions and thick mechanics delayed the whole thing originally).

Too fast? When you don't (a) drink (b) smoke (c) do drugs, you need some sort of buzz otherwise (d) you will kill someone. Obviously I could go back to doing (a), (b) and (c) but then I'd just be like everyone else.