about 10mins of guessing and good aiming is what it takes!! put it on before you connect the 3 plugs to the dials as you can move it and put a finger on the hole and then try and connect it!!
yep it will afect your boost if you have a ep91 as im sure the boost is restricted in 1st gear not 100% on that though and with out a speed reading it wont know what gear your in, it will also bring your EML on after 5-10 mins