Hi, i have just installed a 3'' exhaust system on my 08 3.0ltr GU wich i purchased from supercar-performance in QLD, on taking vehicle for test drive i noticed that there was a hesitation prior to turbo spooling up. Once thru that rev range everthing was normal & smooth driving, would this be affected by the denser air [climate] as i'am from lithgow? P.S I rang them up & they said they have not had this problem up north. any advice would be great Thanks.