As far as I have seen there isn't a whole lot of bolt on performance parts for these engines. If you got money to spend i believe Eaton's has a bolt on supercharger but you also have to make sure your engine can handle the pressure. You can do small things that give you a slight gain. I personally have a 360 and I installed an electric fan to help take off some engine drag and it does help I also have 4.10 gears front and rear. I also rebuilt my top end, swapped my intake for a welded plunem, swapped injectors for 4 nozzle spray injectors, installed an accel distributor and coil and 10mm wires, and I swapped my nv4500 5 speed transmission for a nv5600 6 speed. Now all I pretty much did was make the engine more efficient at what it already did and it runs extremely well and has a lot of go. For everything you put into your engine you got to make sure it gets out with a well made exhaust I would never recommend running straight pipes on anything, I have dual magnaflow exhaust. you can add headers if you want but on these its not really going to give you anything.