right got a decat but knew i had a leak somwhere before fitting it it went on the rollers taday and they said up pipe is blowing but what i need to know is!

on the end of my decat i have an end with 5 holes to fit turbo

but on the end of the up pipe i have seen also has the same fittemt but how can both go on, also the up pipe has a 2 stud hole on the other end so how do they join or dont they even meet?

 

Not quite sure what you are saying but have you transfered the donut gasket from your old down pipe(cat) to the new one?

 

The up pipe has two holes one end which bolts to the headers and five studs the other end. Three of these bolt to the turbo and the two remaining are used for stability of the turbo.

The up pipe is pre turbo. I think your talking about a post turbo de-cat? If this is the case the two parts wont be any where near each other