I have decided to go upgrade my aeromotive 340 to a 400 aeromotive. After doing a lot of research between twin scroll or T4 it seems the twin scroll will spool faster but a regular T4 will make more hp and tq.. So many things to consider with pulse rate of our cars since it is a V motor and equal length runners in such.. I also may bump up to a 1.15 AR but again I still have a lot of things to work out..
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