hey guys, im about to start on a rebuild and I wanted to port my exhaust ports on my S4 N/A housings. i know its no recommended to drill off that metal sleeve thats in the middle of the port. im planning on keeping it N/A

some one told me that you can pop it out and replace it with with turbo ports.

is it better replacing with ports with turbo ports or just going with turbo housings?

please give me feed back, thanks guys

 

Just swap the ports, its gonna be the easiest and cheapest thing to do

 

not like it's very difficult but definitely easier to just get the turbo sleeves.

reason some people say not to cut out the wing is because it adds a raspiness to the exhaust and makes it noticably louder. but it also performs better.

https://www.rx7club.com/2nd-generation-specific-1986-1992-17/writeup-turboing-your-n-port-sleeves-986906/

 

If you have a good catback [Racing Beat -- NOT: Apexi/single/cheap/etc..], then the noise wont be bad. I have FD housings [just like the FC turbo sleeves] with an RB Header/Presilencer/Catback and cruise is quiet and it's quiet unless you rev past ~3-4K in town.

 

another question, these are supposed S4 N/a housings how come one has the Japan stamp and the other doesnt?