Yea that c10 is sick. Since you will be building your own setup you should get "maximum boost" by corky bell. You can get it on Amazon. It explains about exhaust velocity and a bunch of other valuable information. Your best bet is finding a set of stock manifolds that will work for your setup and build from there. I'd say go with 2" from the manifolds and step it up to 2.25" on the way to the turbo. Like Allen said a 40mm gate should work just fine as long as it's plumbed into the right spot. For the cold side I would run 3" for the whole thing and rps sells a 50mm box for $100. Also try to fit the biggest intercooler you can, preferably a 4" core
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