These came on my SR20 turbo and I don't need them. No bolts, no gaskets. The inlet has been cut (not by me) so it doesn't have a funky curve. 2-1/4 inlet, 2" outlet. $35/shipped OBO.

Magnaflow Stainless Exhaust parts, never used. All prices are lower than the lowest I could find on eBay or Amazon, but of course they're OBO. I ended up finding an Enthuza exhaust that no welding was necessary on
12616 Round muffler. 2.5" in/out, 14" case length, 20" overall length. $60/shipped
35136 Exhaust tip. 2.5" in, 4" out. $30/shipped
59926 metallic-core Catalytic Converter. 2.5" in/out. $95/shipped.