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Dave80GTSi · 10-13-2018, 07:11 AM

In my humble opinion, I believe that you are over-thinking the headers.

Is this to be a no-compromise track-only car, where every last bit of power needs to be coaxed from the engine?

If not, I sincerely doubt that one header style vs. another will amount to any performance differences whatsoever, especially if your existing OEM exhaust manifolds are the Euro spec 3 tube into 1 style (as contrasted against those USA spec models which include the built-in cats).

But if you do have the USA spec built-in cat manifolds, then you may want to give this thread a read:

For Sale: Hollowed OEM Exhaust Manifolds, Complete with Mini-Cats

10-13-2018, 07:11 AM	#2
Dave80GTSi Registered User Join Date: Sep 2016 Location: Central Ohio Posts: 404	In my humble opinion, I believe that you are over-thinking the headers. Is this to be a no-compromise track-only car, where every last bit of power needs to be coaxed from the engine? If not, I sincerely doubt that one header style vs. another will amount to any performance differences whatsoever, especially if your existing OEM exhaust manifolds are the Euro spec 3 tube into 1 style (as contrasted against those USA spec models which include the built-in cats). But if you do have the USA spec built-in cat manifolds, then you may want to give this thread a read: For Sale: Hollowed OEM Exhaust Manifolds, Complete with Mini-Cats __________________ 2000 Ocean Blue Boxster S 1980 Ferrari 308 GTSi 2019 Alfa Romeo Giulia Ti Sport AWD Last edited by Dave80GTSi; 10-13-2018 at 07:26 AM.