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Hi, Im looking to upgrade injectors for my r33 which will need to get me to 300kw, now im left to choose from s15 injectors, a set of aftermarket new 550cc injectors or hi flowing mine. What do you guys think is the best option and what have you had experience with and where can I find the best prices to get some, thanks.

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https://www.sau.com.au/forums/topic/275709-rb25det-r33-injector-upgrade/
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The best option is to read.

Hi-flows are super well documented

S15's - same deal

And as for new ones... there have been half a dozen threads in the last month in 550's (and also 740's).

End of the day, it comes down to budget. If you want it done on the cheap - 2nd hand/hi-flows. If you want unquestionable reliability you buy new.

Simple.

just been through this and will help making a mistake. just go the nismo 555. not saying that the s15 injectors are bad but had strips torn of me by my tuner for buying them. they are a pig to tune and and will not be as good as the aftermarket injector. mine have been flowed out to 600cc. he said that they have to be tuned as a 480 at the bottom and a 600 at the top of the maps.

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