Hahahaha, really ah? If I have a SR20DET with the Pulsa type Intercooler (ontop), i change to the Big Mama HKS Intercooler, it will give Turbo lag?
So just change to a Big enough Intercooler loh! Bottom line, just have to maintain the air temp while it goes into the engine...so your engine also live longer loh.
I think most turbo cars (stock), the intercooler is just ngam ngam.
If boost a bit, the intercooler will not be cooling the air fast enough cause the air volume going through not enough.