I went to local parts store... they sell 3"OD exhaust tubing.... pre bent for you and everything. AZ I know sells piping as well, but I dont know about 3". Ask the guys behind the counter because stores tend to hide it in the back.
I've never heard fo or seen this metal intake stuff from AZ. But if its anything like exhaust piping, then it should be fine. The key is the smoothness of the inside. The plastic stuff I was tlaking about causes MASSIVE turbulence and is probably worse than most any stock intake tubing.
The Clamps I'm talking about are hard to describe.... they are a pice of sheet metal with two tbolts to create a seal. A version of them is used by the Navy to patch ruptured pipes..... thats how storng the seal is. The silicone ones are fine, infact thats what I'm sing. But two of them vise the several I've seen on here with 5 or 6. Color matching is key to dressing an engine. If you have the yellow accel coils, maybe yellow coulpers would work. Allot is personal preference. IMO this engine bay needs black.... and maybe some MINOR silver accents