hey guys i am getting tuned at AMS on monday and my tubular exhuast manilfold has a small crack in it i just ordered a new one from MAP but it wont be here in time to put it on before being tuned. How bad will this hurt my performance? do you think it will drastically affect my tune? my afr is still normal like it always has been.
thanks in advance

 

if it is leaking, its a waste of your time and money to get tuned. Push off until you get the replacement from MAP.

 

Don't bother tuning the car until you get the new one on.