I would make at least 4 tie bars that go horizontally and vertically inside the plenum. That will minimize the plenum from expanding and breaking at the seams.
02 M3 - Maximum PSI S2 turbo kit - firstname.lastname@example.org, stock motor, stock ecu
97 M3 - Maximum PSI turbocharged - email@example.com, first in the 9's
Maximum PSI - Home of the quickest BMW's in the US
Click here for E46Fanatics 1/4 mile standings
us on facebook to follow our latest builds and upcoming events!