I have a ball/spring boost controller. It's pretty much exaclty like this...

I have no use for it anymore, and it's helped me well through my Skyline and turbo Miata days. Those days are behind me so someone else can use it. Works great, no boost spike/creep etc.
$20. Local preferred.
I have no use for it anymore, and it's helped me well through my Skyline and turbo Miata days. Those days are behind me so someone else can use it. Works great, no boost spike/creep etc.
$20. Local preferred.