Going to be upgrading over the winter to a Dart 363 with TFS 205 CNC's with a Comp 7879....My current setup only has a 3" DP with a 2.5Pipe coldside pipe off the turbo to the innercooler, steps up to 3" after to the TB. I'm going to run all 3" cold side with a bigger inner cooler to a 80mm TB. My question is should I run a 3",3.5", or 4" DP (4" may not have enough room)I'll have 120lb injectors and bigger fuel system. Still undecided on the intake manifold. May go with a victor 5.0, or a super victor with the 90deg elbow. I know i'll have to fab up the DP just dont want to have to do it more than once...I would like to make 900-1000Hp...What would be the HP limit of a 3.5" DP? .Thanks for the suggestions.