9-3 Sedan, Cabrio '04+, Combi, 9-3X Workshop
Hi guys,
Haven't been on here in a while because the cars has been running great until now.
I've had a BSR Stg 1 tune for a little over a year, and I brought it into the shop for new plugs. When I left I opened her up on the highway and noticed my boost pressure was fluctuating, causing the...