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The best answer is DON'T. Contrary to popular belief the Impreza will run far better with the standard recirc valve unless its a good quality VTA replacement you're fitting AND you have it mapped in.
If not, spend your money on better mods my friend.
Hi , I`m not sure about the 01 model but the 98 model got this roker cover gasket problem because it`s too close to the exhaust and with time can`t handle the heat.So when you rev the car , dropping oil on to the exhaust and one little drop of oil can make big smoke which coming up around the turbo. Hope this helps .
As you may know your car already has a dump valve, all turbo cars are fitted with one so its a matter of swapping, but beware if you do not fit a recirculating dump valve you may find a warning light on your dashboard as the ecu will register the drop in pressure as a leak, also you may find your performance will be worse, not better as the waste gases in a recirculatory dump valve are forced back in to keep the turbo spinning, so less lag
Is it a vent to air or recirculating one. Also it depends on manufacture, some are quieter than others, higher boost pressure will also make it sound louder but other factors are involved with this so I should take advise from your local shop.
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