Not so much a kit but if you bought all the bits from Amayama it would likely be much cheaper and all genuine parts. You just have to know what you're shopping for.

Kia ora. I'm going to replace the cambelt etc. on my old 2.0 NA DOHC BP5. I want a kit that includes a water pump. Any tips on the best place to get a decent kit gratefully accepted. Thanks!

As far as TCU tuning you’re probably limited to CCT as I’m not sure any of the others will get into that side of things.  Tony and Dave at DTech are legends and unbelievably helpful with dumb questions and support so they always get my vote but not sure they will do TCU stuff

+1 for SAS    https://www.facebook.com/share/1BmSrbYsZj/?mibextid=wwXIfr  

'New car' = WRX 30 in 2026   remove engine & drop off to mechanic, they disassembled & heads have returned from testing, all good, waiting reassemble   then most recently   "Old" car (Avenger = 50 in 2026)    'everything' Diff pinion seal nut & bolt check, wheel bearings brakes trans seal + screen, tran mount & bushes, swaybar link & bushes Struts strut bushes rocker seal carbs