Your post isn't cool. People aren't going to learn anything about their car if you guys always assume new people know what you might know.
anjoO - I haven't had any dealings with Just Jap before, but if you just take the trip out there and inspect the parts to make sure they meet the quality you are after I don't see a problem with it.. and if you don't know what you are looking for, perhaps ask one of the older members of the forum who'll know a little more (I'm no expert! lol but I do know a few things!)
I personally go for the quality over the price, I went to Hi-Tech at Darlinghurst for my dump pipe and cat, had a few problems with the part but they fixed it up in no time at all at no extra charge. I would recommend them in a second to anyone wanting exhausts done but again, inspect the part first!
Hope this helps.
Liz.