Just go to the closes LegoLand/Lego Store and grab the bricks you need. Should cost around $5.31 (Illinois tax is different from your city tax I'm sure). They'll even help if it's not slammed.
I have an aFe Takeda Exhaust for a 3.0L new in the box for sale - never even opened. Decided to go a different direction and would rather sell it to someone on the forums than anywhere else. aFe has some decent sound clips on their website.
After shipping, taxes, and the part itself I spent...
I've heard the same and ended up going catted. I don't need every ounce of power. The car is already fast out of the gate. I'm not looking for insane dyno numbers, just enjoying wrenching again and driving something that's fun and fun to work on.