I'm gonna hopefully try the install this week. what tools did you use or what I will need for the hahn stage 2 install? thanks

98 esi A/t:
injen intake
n1 muffler
white gauges
17' adr sokodu's
coilovers 1.75' drop
obx front strut bar
3 stage metal headgasket
(should of rebuilt bottem when this was done but I'm stupid)

Just the bacic hand tools is all you "need". If you have air tools I would have them ready. Sockets, wrenches, breaker bar is going to be a good friend to you, oil sensor socket or = deep well socket. Other than that patience and booze internet access and a car for trips to the store.
Also for the Hrc kit I think you need to do some fabrication work, correct me if I'm wrong HRC guy's.

I edited to the wiki!