i just put in some mac equal length headers in my 5-0 to complement my off road H and flowmaster mufflers..but ever since the headers were installed a weird thing has happened. (my car is an automatic) where the car shifts into the next gears has changed....it doesnt even get out of 1st til around 40mph...and the rpms never red line or anything like that so how is this happening? is this bad? please give me an explanation...if i didnt give enough info please ask. thanks a lot
oh and the car shakes a whole lot now while idling can that be minimized?
oh and the car shakes a whole lot now while idling can that be minimized?