Thoe99

iTrader: (25)

A buddy of mine did a test on the plastic Evo8 bov and found that it starts to leak at 13psi. So I bought a metal Evo9 bov so that my turbo could work more efficiently and not blow as much hot air. First thing I noticed upon putting it on was that it increased my boost pressure by .6psi. Here's a dyno chart comparing the two bov's, run on the same day, before and after installation of the evo9 bov.



The more saturated-colored lines are with the evo8 bov; the paler lines are the evo9. Looks like the main change, higher power curve, was caused by the increase in boost pressure. Overall, it's nice to know that this metal bov holds boost much better.