cats dont make metallic noises, 4efte has a ceramic catalyser... you shoud tell if its your exhaust its a pretty distinct noise. give your backbox a kick... if not it could be a wheel bearing on its way to heaven. they make grinding noises when dying.
DONT DO IT.... i imported my first glanza. mate SO MUCH FUCKING AGRO. it worth paying an importer the fees to sort it. because doing it yourself is a shit job.
you must be joking. they have like an 1 hour maximum drive restriction. i had to regularly stop on long trips to straighten out my back.... do you have masochistic tendancies???
doesnt need one. no. just make sure you block up the hole in the air intake after youre done fitting the new bov. i like the stall myself. 1.8bar with no bov is lushness
it wont stop curbing mate. its called armourfend or something like that. its a pain to apply though. if you dont clean it properly it can discolour etc. it has its pros and cons. google it to see what you think.
when talking about the big names (hks, blitz, sard, greddy, etc) quality isnt an issue. they will all be above and beyond what youll need from them. it all boils down to sound preference. and i still think the ct9 sounds gay when it stalls.
ct9 compressor stall sounds GAY though. like, really really gay. it sounds good on the right size turbo. and as for BOV. the HKS one is good, but it will annoy the fuck out of you after a few weeks. blitz one is a little more bearable.