can i use 450 cc injectors on my stock p28 or will i have to chip it?

 

no

 

Think about it, your computer is telling the injectors to stay open for a given interval because it knows that during that time it will deliver a certain amount of fuel. If you change the injectors without telling the computer, it will think it is still using the 240cc injectors, holding the injectors open for the same amount of time. 450cc injectors will obviously deliver more fuel at the same time interval, thus creating a rich condition. So, no, chip that bitch, son.
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aight thank you for the info