Looking at sorting my pipework out for my custom IC. Am running 51mm connections on the IC was just wondering what others have done with the IC outlet to Inlet manifold tophat?

I only ask as the diameter of the top hat is very small and i wouldnt have thought a reduction from 51mm to 41mm (approx.) would be ideal? Also the outlet pipe from the turbo ends with a similar smaller pipe fitting - have you all replaced this downpipe to finish with 51mm?

I am running the samco std kit at the mo and would hate to start replacing it.