question about custom header & test pipe

Just wondering if anyone has had any experience making a custom N/A header and test pipe for their G2? I’m thinking while I’m at school, and have access to free pipe benders and welders I would give it a shot. Just wondering if anyone knows what size tubing I should look into, if I should keep the same bends as the stock one, and if I should make it one or two piece? If anyone has any ideas on how I could go about this, let me know.