Hello everyone, I am new here. I just purchased my first wrx and I couldn't be more in love with the car. It has it's small problems that I'm giving attention. However, there is a problem I did not expect. The engine is making a slight....I'm going to call it a noise, from what I believe is cylinder number 3? The one driver side closes to the headlight. Well, the noise only occurs sporadically and it only occurs when the engine is warm and at idle. I'm paranoid that I may have made a bad purchase. I've done some research here on this site but nothing was really exact to my situation. I know its hard to diagnose a car over the internet, but any advice or knowledge is greatly appreciated. Here is a little info on the car, It is a 2003 wrx 5spd with 153,000 miles and to my knowledge has never had its timing belt changed... almost 50k past due ( the timing belt kit was the first thing a bought, just haven't had time to replace it). The car has a stage 2 tune from openecu.net. I'm not familiar with the tune so if anyone knows how to return the tune to stock please let me know. The car also has a 3" exhaust, cobb intake, and 3" godspeed turbo inlet. Again, thank you so much for any tips/advice you can offer.