The 2015 Audi A3 Sedan 8V 3rd gen reached the market with a choice of three engines - two gas and one diesel. The two gas engines are both members of the chain-driven inline-four aluminum EA888 APR recommends using colder heat-range spark plugs, like the NGK-R7437-9, gapped to 0.024" ±0.002" or 0.6mm ±0.05mm for stage 1 and 2. We always recommends upgrading/ replacing when tuning your vehicle to help minimize the chances of misfires. If you are looking ti upgrade your ignition coils, we do offer a RS3 Red Top Ignition Coil .
Depends where you get it done at but just the stage 1 you can probably expect it to be around 700-750 with labor. If you plan on going stage 2 you’re better off just going straight to it. I believe it’s like anywhere from 2K at the lowest and 4K for a full system.
