Work your way outwards in a spiral pattern. Also is your decat braced? If it is then when you put the turbo kit on you want to tighten the mani bolts with your fingers so u can still wiggle the kit about. Then get someone just to lift the kit while its in place just to take the weight off it. Than tighten your brace bolts right up. This effectivelyputs the whole weight of the kit onto the brace rather than the head or the mani. Not doing this is the main reason most manis crack. Very rarely even with cheap ebay 1s its not the poor quality that causes the crack but poor fitment and the weight of the whole turbo, decat, exhaust all being on the mani.