The crossover/balance pipe increases exhaust scavenging and increases low end torque and top end horsepower, it's not an absolute necessity but if I were fabbing up a new set of pipes I'd included it for sure. I'd be interested in a set but I'm in the US I could probably have a set made for the cost of shipping from NSW. Hope the balance pipe info helps.

Outside a dog a book is a mans best friend, inside a dog it's to dark to read.