Grab your self a set of SDI injectors first (ÂŁ50) and try to get them not to smoke without a remap, e.g. clean air intake system, open cone filter, flow through exhaust, hyrbid turbo. Going through this process, you will learn alot of about your car and other limitations, e.g. gearbox. If you can achieve this setup, then your car would be ready for wingy injectors.
Seriously, wingy injectors can seriously contribute to damaging your car. They should just not be popped in to get 150 bhp. If you want 150 bhp, the sdi injectors and a Ready Remap will achieve that for about the same price and only very small risk of any damage.