Metal Gasket

[8110]

Hi. Can anyone guide me with regards to metal gasket? I have a RB25DET NEO and are looking at Cometic gaskets.

They have 4 sizes and are unsure which one should I go for:-

i) 86mm, 1.3mm thick

ii) 86mm, 1.5mm thick

iii) 87mm, 1.3mm thick

iv) 87mm, 1.5mm thick

My motor is basically stock internally. It only have bolt on mods like exhaust and intake plus an up in boost. Perhaps in the future it'll carry bigger boost via a bigger turbine but basically internally will remain stock.

Which gasket should I go for? Stock bore of the motor is 86mm.

Thank you.

[Moodles2]

If you are going to put over 20psi through the engine, might want to look at using the thicker gasket to bring the compression down.. otherwise best to keep with stock compression for better response/fuel economy.

[8110]

Don't think I'll be pushing out more than 20psi anytime soon. So I guess 1.3mm is fine.

It is best to stick to 86mm bore size?