Id always chose to show results if the builder agreed. I'm all about helping the community(I wouldnt of been able to finish my build without the forums help without buying things 2 and 3 times over).Id leave showing the results up to the builder, it's not like i understand these engines enough. I researched servals a lot before laying down money. There was only info on 421 servals and just griff's 10 non ss. But on the topic of believing your builder saying a certain set of pipes do this or that......if you cant trust the person doing your engine's word, you shouldnt go with them. I went shearer over sniper for my build off his word. No regrets.