If the airtec was as good as the spec r is have one in the front of my car, facts are it most deffinately is not. I have an identical core to what spec r use with pro alloy fabbed tanks as I couldn't justify the expense for spec r one.

We have done testing with the airtec at 550bhp and 34psi held from a t4 and the airtec isn't what I'd choose for my car running the same set up.
Spec rl's cooler with 780bhp running 34psi held from a much bigger turbo kept IAT's exactly where we want them I know the airtec wouldn't have been anywhere near.

IMO for upto 500bhp this is a great cooler with a awesome price but anything after I would advice saving for the better one

All IME ofcourse others will dissagree I'm just saying it as it is.