will the GSR water pump fit and work correctly on a b16a? will it make a difference in HP?

 

yeah, the water pumps are the same. and no it won't make more hp

 

Yup they're both 22T pumps, all DOHC VTEC water pumps are the same... And just as 98SpecR said, it won't make any difference hp wise...

 

What about the oil pump? is the gsr better?

 

Most late model pumps are all the same, for sure the B20B/Z = the B18C/1/5... I have a 2000 Si pump sitting in front of me along side of a B20Z's and they both contain an 80mm rotor and look identical... The shim might be different, but I don't really know as I haven't pulled it apart and measured it yet... As for difference in hp, not here either... Hope this helps