On the exhaust system side, run a 3-in. system only if you have a single pipe from the catalytic converter back. If you have dual pipes from the converter, we recommend using a 2½-in. pipe.
The LSA came equipped with rectangle port (LS3-style) cylinder heads. However, the supercharged heads were Rotocast for added strength. The engines also use the same 4.065 in. bore block. In fact, the engine block casting number is the same as the LS3.
The factory heads are based on the LS3 heads. However, they have a flow vane in the intake port. This helps emissions and idle stability, but reduces flow. CNC porting the heads is common. This removes the vane and improves airflow by about 70 cfm. Aftermarket cylinder heads are another option. These heads will flow even better than ported stock heads and have thicker deck surfaces to withstand more boost.
More importantly, the video will show some simple tests you can do to make sure your mass airflow sensor is the cause of your problem, so you don’t waste money by replacing perfectly good parts. Think because your engine is fuel injected you don’t need to worry about heat causing you problems and stealing horsepower?