Have any of the 400 guys swapped out there existing exhaust mainfold for the slightly better 98+ gs400 manifold? I searched a lot but i know most of guys wouldnt do this because they have the money to burn, but I really dont want to spend a bunch of money to make those OBX headers work right. I know the gains with the swap alone would be minimal but with a SAFC and dyno tuning the gains would be better right? Im not looking for any crazy numbers but something better as it is my daily. Thanks for you input in advance.

 

PPE engineering. They have headers for the sc400. I'm running rush headers on my 400