Yeah, what the hell are rev bangers?
Looking online I think it applies to the following cars having there PI fixed and the leaderboards adjusted:
These are the cars that have been fixed so far.
1980 Abarth 131 Abarth
1965 Alfa Romeo Giulia Sprint GTA Stradale
1971 AMC Javelin-AMX
1969 Chevrolet Camaro SS
1969 Chevrolet Camaro Z28
1970 Chevrolet Camaro Z28
1979 Chevrolet Camaro Z28
1970 Chevrolet Chevelle SS-454
1960 Chevrolet Corvette
1970 Chevrolet Corvette ZR-1
1966 Chevrolet Nova SS
1970 Dodge Challenger R/T
1969 Dodge Charger R/T
1967 Dodge Coronet W023
1968 Dodge Dart HEMI Super Stock
1970 Dodge Coronet Super Bee
1964 Ford Fairlane Thunderbolt
1970 Ford Mustang Boss 429
1978 Ford Mustang King Cobra
1971 Ford Mustang Mach 1
1973 Ford Pinto
1992 Lancia Delta Integrale EVO
1971 Lotus Elan Sprint
1999 Lotus 1999 Lotus Elise Sport
1990 Mercedes-Benz 190E 2.5-16 Evolution II
1954 Mercedes-Benz 300SL Gullwing Coupe
1970 Mercury Cougar Eliminator
1970 Nissan Datsun 510
1968 Pontiac Firebird
1969 Pontiac Firebird Trans Am
1977 Pontiac Firebird Trans Am
1965 Pontiac GTO
1969 Pontiac GTO Judge
1980 Renault 5 Turbo
2009 Renault Twingo Renault Sport Cup
1968 Shelby GT-500KR
1985 Toyota Sprinter Trueno GT Apex
1984 Volkswagen Rabbit GTI
A good example of what rev-banging is are the top A class Trueno and B class 79 Camaro replays on Road Atlanta on the straight away. The cars quickly accelerate to top speed due to the stock gearbox and race engine upgrades thus they max out and bang the rev-limiter for around 12 full seconds as they go down the straight.
Usually if you have an ill-suited tune and bang the rev meter for 2 or 3 seconds you're leaving a good chunk of time on the track but these cars dominate despite rev-banging for more than half the straight.
Apparantly there are a couple of cars that the community are saying have been missed by this update though, those being:
Lotus 2-eleven (R3 Class)
Ford RS 1800 (A Class)
2010 Renault Clio (A Class) FWD with Megane RS 250 engine and no camshaft upgrade
These cars are also supposed to have an unfair advantage as well:
Lotus Exige, Elise 99, Elise 05
Vauxhall 220
Opel Speedster
Lancia 037