Put a recirculating blow off valve on there. Instead of it venting all your boost into the atmosphere, it just circulates back before the turbo.
Depending on the engine/turbo sizing, an atmospheric BOV's can absolutely kill power. (then again, most of the time they don't) An ECU will still see X amount of boost as the throttle plate is closing and continue to deliver a larger amount of fuel. Instead, you go way rich because none of that air is making it to the engine.
About the higher than normal boost. Look for a manual boost controller to be installed on the wastegate (something like this)
(or this)
(or as simple as a $5 pressure relief valve)
Basically a fitting with two nipples, and something that screws into it. That is the cheapest way to up boost, help slow down wastegate leaking (all spring gates will leak, slowing turbo spool), and play with boost spikes.
'cource it could be an aftermarket wastegate, or simply ECU re-tuning that's allowing for more boost.
Wastegate/BOV
"Skoolin' the unlearned!"
) currently I have a HKS BOV and that is all of the mods, It just came off the ship a week ago(using it to promote my business)and I havent made any mods since then but I have done a full refresh on all fluids, belts, plugs etc.
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