They cost £290, which is less than my dev-tour it replaces (it snapped 3 times!) It has fantastic power and if you had a taffspeed and a NK exhaust on at the same time , that is what it feels like but with more pull. Ive never seen an exhaust that has a range from 3500-9000 rpm all of it is fun and more hp than my old dev-tour. The white on the exhaust is Silicone. I wiped it off before I took the picture undernieth the scooter. I use it to seal the holes in the footboards so it doesn`t rust there. The pipe is ungroundable! You scrape your footboards and stand even on a series 3 before the pipe. Look at the stand on the piture. You cant see the exhaust on the other pictures, no one would know you had it! This is the older version that I had on my GP... If you want to buy one you should put down a deposit, you may be lucky and get it with the next batch in July. He builds them alone so it takes a lot of time, especially the snail. Before you ask, I dont know Simon and I have never met him. If I am pleased with a product (which isnt very often) , I like to let the scooter community know about it because iv`e bought loads of usless crap over the last few years so the good guys deserve some credit. Anybody here going to Oslo next month? Its mostly vespas from germany that come over here and it would be good to see some lambretta`s. I will even let you try my scooter Cheers, Rob