If you don't get your car retuned after the mani swap are you not getting the full power...aka how much are you leaving off the table.

 

I would say quite a bit. Your A/F ratio is off.

 

Ok I ran it tonight untuned....the car is tuned just not for the mani swap. So hat would still make a difference? I ran a


13.8 at 102.26 with a 2.19 60 ft.

And

13.8 at 101.78 with a 2.16 60 ft.

81 degrees 70% relative humidity wired the times were the same but not the traps. I have ls1 manifold. Hogan catless downpipe. And flowmasters on stock exhaust pipes. Car is tuned but not since ls1 manifold.

 

When I swapped my ls6 intake it was shifting early . Once tuned whole different story . So I would say you not getting 100% gains from the swap until you retune .