Mac L|T's Questions

Well i just finnished installing some mac long tubes for my 2000 GT i think the worst part was putting the springs back in but anyway my question is how does any exhuast leak sound like? is it real distinked sounding ? i painted my header with some hi-temp paint ( dyno tested stuff) cause i bought the cheaper HTS coated ones and i was wondering if the paint might be whats smokeing or if i might have an exhaust leak.. also it only smokes after like 2 - 5 min after the car has been running. if anyone has any answers i would be very thanksful thanks.

p.s. open header = lllooouudddd

took about 2 full days and is used this write up http://www.fnsweet.com/garage/lt_install/index.shtml
it wasnt to bad just get the front end up pretty high and be ready to take your time tightening the headers. thanks for the replys i hope its just the paint and what not burning up cause an exhaust leak would be instant i would think cant get over how loud the oen headers are ... gonna be quiet the drive to get my x-pipe refitted up to them