I have a custom highflow done by hypergear. I asked Stao @ Hypergear to make me a real responsive turbo Pushing 253rwkw Tuned by trent @ chequered at the moment. Great turbo but upgrading to a HKS GT-RS. Turbo has done approx 10,000km. $700 , currently on my r34 gtt til my new turbo comes. Can provide test rides if genuinely interested.