So I have an Allen S/C with a tune From La Sota. Before the tune the car ran 15.2 which I figured the tune would help a lot. However, last night I ran the car and it only ran a 15.0 and 92mph. My question is, is it has true duals from the guy I bought it from could I be losing power from not having an X or H pipe in there? Or is something else going on?