After switching to A2A (UK developed) the tuner noticed that the boost was not what he was expecting. I upgraded the SC from a SCI to and SI. Boost was better, as expected but still low.
I now have something similar, I dont have a coupler but some alterations were made so that the intake pipe into the SC was not restricted. I now have a large cone that sits above the FMIC with the pipe the same diameter as the SC charge opening with no restriction. This means I can change the filter without SC removal, but I still need to remove the bumper.
Boost was not so high that I have reverted back to the standard pulley. Car is currently sitting around 550bhp/400ft-lb, which is as high as I want to go with the A/T.
I also removed the MAFs and have the car Density mapped to remove the recirc piping and save room.
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