Again with COVID and time passing away - my thoughts on where I am going next. There is boost creep. I originally thought the SBC was playing up so at some expense I replaced the twin solenoid controller. Makes no difference. Boost is uncontrolled above 5K and peaks out around 1.7 bar. Thankfully the engine appears strong enough to take it.

I still have an AFR bung to fit. My main thoughts now are towards boost control. I don't think I want to change the exhaust manifold - not after all that work and money, to fit something with an external w/g fitting. e.g. http://swedenexhaust.se/en/volvo/198...rial-mildsteel plus I am not sure this would clear the brake booster on a LHD car. TBH boost creep was never an issue I'd thought I'd have to face. I can either port the W/G hole further and increase the flapper size? or fit an intercept between the manifold and the gtx, with some kind of v-band flange or feed pipe to an external w/g.