What is different now that people are able to hit 500 and some have seen 600 hp on stock sleeves. Because when I first started everyone shop I went to said to see those numbers you need to sleeve. So my question is if I am trying to reach 400- 450 hp dd is it better to sleeve or stay with stock sleeves.

Set up ls/vtec
Block
B18 ls 81.5 bore
Cp piston 9.5:1
Eagle rods
Head
B16 kms valvetrain
Brain crower stage 2 cam
1000 rc injectors
Hondata s300
Turbo holset hx40
Custom exhaust manifold
So what u guys think or I sould just sleeve it.