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I had local workshop put a 3' exhaust, upped boost and increased fuel supply on my GU1V ute. Max power up to 155hp (US dyno) at wheels and unbelievable improvement on driveability and over taking.
Fuel economy virtually unchanged after I got over boy racer with new toy syndrome. Boost gauge shows about 5 lb boost at 100kph and exhaust temp 300 although goes up to 15 lb and 450/ 500 quickly when under load but drops just as quickly when you back off. Most impressed.