Is anyone here well versed in turbo engine theory? Interesting topic this that I'd like some more background on, but there a multitude of articles across the web, each contradicting the other! My understanding has always been that n/a engines need a degree of exhaust back preesure, but install a turbo, the idea is to have as low a back pressure as possible to allow the turbine the least resitance to spinning. It is for this reason I spent a little extra in ordering the Scorpion down pipe that splits into separate pipes at the top as opposed to the Milltek that is a single pipe down to the secondary pipes. Had a long discussion on this last night (we had a storm that took the power down and it was pointless letting the beer get warm...) and the 'other' subject of pre turbo back pressure. Checking on google this morning confirmed why this is such a heated subject!