I had an overboost issue, and blew up the K04 I had. I have a speedtuning chip and I'm supposed to be boosting 20psi. Speedtuning recommends I get a boost controller to fix the issue. My car does have an N75 valve, but I'm not sure if it's working since I was boosting so high.

Manual boost controllers don't look very expensive, and I'm looking for the cheapest fix. Any thoughts?