Mainline will be supplying, and operating, the dynamometers at next year’s Street Machine Summernats 25 Chrome Jubilee Car Festival, proudly supported by Rare Spares. With the return of the famous "Horsepower Heroes" competition, Mainline will be making our inaugural appearance at Summernats Car Festivals, armed with not one, but two, twin retarder "extreme performance", custom built 2WD units, to cater for both the “Horsepower Heroes”, and the ever popular "Dyno Test" entrants. ... - Andrew