Any ideas guys, was driving along the bypass tonight at about 70mph and was going to speed up a little. So accelerated a tiny bit and the car was almost jerky hardly noticable though. Then I pressed my foot down a bit more and the boost gauge flew round to 25+psi so I removed my foot and the car like stuttered. Similar to if someone bangs a clutch. Also another little not so important question. What does stiffening the spring in my DV do? Just last week I tightened it up a bit to stop it blowing off so easily. Cheers.