Quote:
Originally Posted by scooby doo
The ra won't as then will need map and a lot of money for just ported headers,
Is there any proven gain from this aswell??
The rcm is a great fitment too , but will loose a little rumble from them
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A certain funny blue STi ran with ported headers for quite some time before a remap.
I noticed a spool improvement when I did mine and again didn't bother adjusting the map.
It just makes it breath more easily and gets a great volume of air to the turbo quicker..
There are better gains to be had from ported OE then a lot of aftermarket so called performance headers.