I'm brand new to the forum, so bear with me. I just purchased a seemingly bone stock 2002 Wrx and it drove perfect during the test drive, but over the past few days I've noticed some strange inconsistencies. At times the turbo will seemingly not provide any boost. The gauge is extremely shakey and if I try to push through, I hear a hard click/knock and the boost gauge will drop all the way down. Also, the cruise control has stopped functioning as ha the heater fan.. additional information to know is it has an aftermarket downpipe that I have no info on as well as a turbo timer that I have no info on. I have fallen in love with this car, but I leave for college in 10 days and it is an 8 hour drive from my home and it is very cool where I'm going, so I absolutely need cruise control and heat. Thank you in advance for any help you can provide! I'd be more than happy to post pictures or give you any more info I can!