I purchased the first cores for Spec-R. The garrett core chosen was the most efficient at a £650 cost point. If £2000 was the cost point far more efficient cores can be found. Companies have copied the shape & Top entry but then use a far less efficient core, thats a cheaper way but not as efficient.
We saw negative degrees on mine on initial acceleration with +8 on full bore.
Using a RS500 cooler the Injection would be on after a few seconds at full bore to keep temps in the 30's.
If you are not putting your car against the clock then you wont know the Power you are losing because of an inefficient Intercooler. Just ask Mark about TOTB1 if you want to know how bad it can get when you max out your cooler efficiency .