just got a custom top mount intercooler made for my car but since fitting the car has really bad lag turbo comes in 1000rpm later and not as good as well has anyone else experiecned this sort of problem with aftermarket tmic, car is being tuned on saturday so im not that bothered but is it normal`

 

I'm no expert but it probably needs a re-map

Simon

 

i know it needs mapping but i want to know if its normal to get lots of lag after fitting an aftermarket top mount