So im gonna go through with the 4v head swap and tune, along with underdrive pulleys and a cam ( havent decided how big) but what do you guys think? Shes been running a 13.7 and still havent gotten the launch down got alot of wheel spin at any launch over 3k. (cars currently got straight pipes with flowmaster 44s, 3.73 gears, intake short throw and a tune)