BACKFIRES!

The custom cars should backfire when you shift if you have the S2 or higher turbo, and old muscle cars should make a small popping sound!

 

It would also be cool if you lost power for half a second in older cars.

 

I always lose count when counting backfire suggestions.

 

That's not a Backfire, its an Afterfire. Backfire is before the combustion chamber and Afterfire is after the combustion chamber.

 

Backfire means unintended explosion/combustion in the intake or exhaust.

 

for troubleshooting, engine mechanics more strictly define an ignition of fuel within the engine exhaust system as an "afterfire", while a "backfire" is this same process taking place in the induction system.

 

.....what

 

I copied that bit here:
https://en.m.wikipedia.org/wiki/Back-fire

 

Once again, from the same article you listed.
engine mechanics more strictly define an ignition of fuel within the engine exhaust system as an "afterfire", while a "backfire" is this same process taking place in the induction system.