I know my up pipe is aftermarket as it definitely stainless. I decatted my factory downpipe(by smashing out the cat converters)and put it back on. Made a massive difference too. Was also thinking Yellow Injectors, Walbro Fuel Pump, Split Fuel Rails and a VF Series Turbo(whichever one i can afford). But i want to work on handling first of all mainly. What do you guys think?