Difference Between These 2 Turbo-back Front Pipes?

[DuFFR32]

Hi just wondering what the performance differences would be between these 2 turbo back front/dump pipes

They are both stainless but one is a split dump and the other 3" non split.

Is there much performance gain in having a split dump pipe?

I have the first one on my car its not stainless though bolted to HKS2530 on RB20DET standard exhaust manifold

Here are the 2 im looking at

JJR Stainless 3" Bellmouth Front/Dump Pipe - Nissan $199

OR IS THIS ANY BETTER?

JJR Stainless Split Dump & Front Pipe - Nissan Skyline $269

Reason being - Im doing exhaust manifold studs atm and could do upgrade at same time

sorry if this has been covered before

[kurosx]

Possible slight performance increase, but id go with the bellmouth dump, saves $70.

[rb20_180sx]

got the non split dump pipe on mine i think i works really good saves $70 aswell