I modified mine heaps. Im doing around 60 but I have to fix it every night for the next day. I feel like Im in the world rally.
Today it started leaking from the head gasket. I pulled it apart on the side of the road reseated it and still got to Manly on time. I also bounced of the side of an NRMA van. Luckily it stopped me from going over.
What was really funny was passing cars going up the spit hill (pedalling as well). Just goes to show how bad the traffic is here.
I bought my set up for $300 from a shop here in Penrith but be warned they needs heaps of development and tinkering to keep them going.
The vibration is real hard on them. Ive already beefed up the engine mounts, welded the exhuast pipe together and now I need bigger head studs.
If you buy one Ill tell you what to do to make them go better.