Do it and post the results man! Help the next guy down the road. Then people can see what is needed for this power level. I'm also doing a 500hp build but trying to only do what is necessary not what everyone else did to make a 800hp engine that only pumps 400.I'm trying to find out if it's needed that's all, like you said 230 or so bhp on stage 2, a more "free flowing setup" which is about all the info you get and you get more like 250 bhp, but I've done a lot of research and my 2.75" maf will flow fine up to 300 bhp, so no need for a maf, everyone used to say 4 bar fpr is needed for stage 2, since then people have realised that a 3" maf and 4 bar fpr aren't needed on a k03s, as well as lcr injectors aren't needed. Makes me think an oversized tip wont be needed at this power level either.
I get what your saying, go bigger and you'll get better results.
But what if my silicone tip is good enough to flow say 270 BHP, and wont give any performance gains going oversized as the one I have wasn't becoming a restriction at this level of tune?
That's a waste of £135 right there.
As far as I was concerned, free flowing is a decent 3" decat/200 cell sports cat, 2.5" the rest, healthy dv and a proper front mount with free flowing 2.5" piping, to me a bigger tip that has the same outlet and inlet size isn't going to do much, especially when it's on the inlet side of the turbo, pre boost.
So long story short do what you feel is necessary I will be watching closely I'm here if you have any questions brother.
Dont do 4bar fpr. Like ever. It's a bandaid modification not the right way to do it IMO.