some one had drilled a small hole there i was going to use a silicon coupler but i did want it to burn like i said i just installed it like 2 days ago i know if the duck take wont burn i could use a silicon coupler or if its a big deal its just a 2 inch aluminum pipe anyone could get another one an some time i put tape under my couplers cause i feel it seals better i have the couple and i have maybe driving the car for 2-3 hours since i installed it- hasn't burned thanks for noticing i guess