depending on how far apart are the end pipes of the 4.4i, maybe you can cut out the back wall of the T815 tips and slide them over the 2 tips of the 4.4i. my brother has the 4.4i when he comes over i will masure the distance from the edge of 1 tip to the other and or i will try to use my tips to see if it will slide over them, i`ll do this on monday when i go over to the shop.