My engine should give 500hp on std head and spec-r cooler, and be 500hp all the time, due to acts, if I had headwork I'd only see around another 20hp. The head was already bolted to the block when I took the build over, so left it

So I'd lose 20hp from no headwork on my engine, but lose probably around the same or more in the summer, with a normal cooler

Would be interesting to see how the Airtec performs back to back with Spec-R with around 550hp

We'll see next summer won't we