Any gains? or just wait.

[Bbert209]

Hello, be a while since I've been here, so my question is that I'm finally moving back to working on my 08 mugen, it still has the tune that EFICU did in 2021, just a throttle body spacer and a skunk2 cai, still chatted, with mugen exhaust, car has been running great all these years, so my question is by adding the skunk2 3in cat back will i see any more gains over the factory mugen exhaust and catalytic converter, or can I just throw the cat back on and just be OK, or just wait till I get the alpha header?

[Spunkster]

There are probably no gains to be made with that.

[Bbert209]

ok so just wait till the header comes in.