Had my stock exhaust manifold ported and also added the SS Autochrome O2 housing and it made a huge difference on my car. Wow! Car pulls so much harder up top and it feels great. Wish i would of done this before, the turbo spools alot faster. Just wanted to let everyone know. Also the install was really easy, WD-40 is your friend. I used these two threads for a reference, they really helped out with the install. Also i left my radiator in when i did this, it can be done, you just need to be carefull.


https://www.evolutionm.net/forums/sh...otside+install

https://www.evolutionm.net/forums/sh...d.php?t=126245