Hey im a newbie about evo, i drive a 9 mr, and i want to instal al o2 housing and a exheust manifold, but i dont now wich to buy ive seen diferent brands but 2 are interestin

invidia o2 housin
megan 02 housin

but i dont know thw differences betwenn boyh, ive never found the bore sizes neither the megan exhaust manifold, cuase its cheap but i dont want to buy cheap dont have any improvement

thank you for the tips

 

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