Manifold/header question.

[danger_day]

This might sound like a really stupid question sounding like "which one is best" but just wondering as there are loads of different manifold/headers out there but there are some which are 4-2-1 manifolds that removes the cat and there are ones that are 4-2-1 but bolt onto the cat. Say for example that toda did two versions of their racing manifold, one being the 4-2-1 bolting straight onto the centre pipe and the other version being a shorter 4-2-1 bolting onto a decat pipe (where the cat would normally be), would the performance figures/gains be the same?

 

[Ellis]

Im no expert but id say one that bolts straight to the mid pipe as the system will have less joints therefore better flow. However, im betting there is no significant difference power wise.