kotik

So local track has db limit, and im running headers and xpipe with no cats... So the car is pretty loud at wot... I can close the valves in the exhaust, but is that ok to do? Or that bad for the engine/exhaust?

joshz06

Takes place all the time..no damage.

Unreal

You wouldn't want to hold them closed at WOT, and how would you do that anyways unless you have an aftermarket controller to keep them closed. I know on the dyno there is a solid 30+rwhp bump when the valves open, so it will definately slow the car down if you keep them closed.

kotik

I do have a contoller. I dont care if i loose power, its either me not going to the track and doing the speed limits, or loosing a few hp but having fun at the track.

So as long as there is no damage to the engine/exhaust, i have no issues closing them. I was just thinking it could cause backpressure to intease