NismoSkyline17,

i've used the JP2 with both my max M5T (nova P5 based like ur B5) and V-Spec, works well with both engine. good mileage(8+mins on my M5) and excellent durability.

the JP2 is a top-end pipe, suitable for engines with lotsa bottom power. not the most power overall tho. the nova/RB 86 will give your B5 the most top-end power (at the expense of mileage and durability).

and btw, if you're getting the JP2, get the polished version. i've tried both polished and hardcoated, the latter seems lesser powerwise.