The Alpha is engineered for the extra torque and HP. I think the the Alpha package adds about $4000 to the invoice. But you getting a GM Engineered Warranted Vehicle. Those After Market Superchargers are around $5000.
There nothing more the a supercharger made to work on the I-5. How good..??? Wouldn't want to find out after blowing up a diff or tranny and find out I have no Factory GM Waranty left.
Stick with the GM Engineered ALpha..
