So, Brian Silvestro's post on M5 went great and I suggested that Alpinas should also be considered. So, which in-house or slightly related tuner makes the best cars. Not just horsepower but overall driving pedigree and pleasure. Can include the recurring models of R this or that or T or whatever common extension a maker adds to the car to signify the race pedigree. Lets keep the list to top 5.
3. Whatever the RS for Audi is