[War_Wagon]

Yes, 10 degrees advanced and 10 degrees BTDC are the same thing, I just always use the less technical term for it, sorry about that. So assuming you check your timing and it is set at the factory recommended 10 degrees BTDC, then if you advance it to 12 degrees BTDC, you are only moving the distributor a very slight amount to get that extra 2 degrees of timing advance out of it.

And I am sure the car feels faster with the big pipes, as once it gets rolling it can breathe a lot better, but for the sake of increasing your mileage, the stock size exhaust would have given you a bit more low end torque do to backpressure, meaning you wouldn't need to use as much throttle to get moving from a dead stop. Helpful if you do a lot of city driving. But since you have already gone to a 2.5 inch system you might as well just enjoy the sound!