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The only thing I will say is that the Edelbrock develops a lot less power and torque than my Harrop. However, the comments about road drivability are spot on.

In an update of mapping the tuning box, good progress has been made. Nervous me has had plenty of reassurances from Richard and Gary has checked the fuelling which is nice and rich on full boost at the top end. I have also received information from trusted sources that the stock bottom end will take 500bhp and been advised that I'm barely tickling it at 305bhp. This is good news. I have had some revisions done to the map, to wind back the boost a bit at 3000rpm and make it a bit more linear. The guy at DTUK has been excellent with taking a lot of time to discuss and revise and checking in with me every day this week, when I've been in the car. This has helped and the car is absolutely flying now. The boost increase is 0.2 bar/2.9psi, so it's nothing too crazy. Really enjoyed the EVO article too.