Turbo Manifold Ext Wastegate Downpipe Custom Oil and water lines Possibly fuel pump upgrade Injectors It's a bit more than just "done" heh! and nearly everyone who fits one says yeah they are great but they don't transform it in the low and midrange. It's mildly better in those areas agreed and higher up power is better butnot everyone wants to go that route. I had a gtx3582r sat there when I bought my 32gtr but decided to stay on the twins altho mainly that was nostalgia and keeping the stock layout. I agree tho it's a serious way to improve all over but it's also £££