The glass paks I used were 3 1/2" diameter, I stuck some stuff around them to hold them centered then welded them. The tips I used had a 2 1/2" hole, the paks were 2" style, the pak stuck throu the tip hole, thats where it got welded, remember mine are on stock exhaust. You can't fit the 4" diameter pak in the tip and thats the diameter of the 2 1/2" pak. Thats why when I do mine again I'm doing the same as you, NO glass packs, of coarse same tips as I did the first time. I don't think it will be to loud since the sound clip MarkVIII93 posted sounded great to me. Besides the pak in the tip echos in the car, the exhaust is still stock before the tips and I picked up alot of interior noise, I'm assuming its echoing, its the only possibility.