well make sure u use something good to hold on the wrap. my mate works at a tuning place tune jap cars mainly skylines evo's imprezas and the like and he has allways been reccomended to do 50% lap. last thing u qwant is to do it and get a gap appear when u are finished. here is what iv done so far http://i2.photobucket.com/albums/y46/ciaranboylan/6-2-12.jpg i have also used some sort of wire he gave me that does not expand with the heat.