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if you're going to upgrade the Turbo (why not when you can get stock like response but a heap more power) go for the Hypergear SS highflow - around 250rwkw and very similar response to stock. You'll prob need a Z32 AFM, but you MIGHT be able to get away with it. I maxed the resolution at around 240'ish rwkw on my old GTT.

You'll need a GOOD intake pipe made up as well if you switch turbos. The old 'shove a metal pipe in' has it's limits, you'll need something custom made up - DON'T go the silicone options, waste of time. Metal, metal, metal.

Injectors are a much easier deal now-a-days, just grab some Injector Dynamics injectors. Start around the 725cc mark, but i'd prob just get 1000's to allow for E85 :D Or get the 'no-name' variety of Bosch EV12 (i think) style injector, that's what the ID's are based off.

I went nistune, hypergear highflow, stock airbox, stock BOv, highflow panel filter, return flow IC (plus other supporting mods) for bout 5+ years with GTT - never any cops drama's at all. Make sure the exhaust isn't too loud, and following all the great advice already in this thread you'll have a mean car that's still quite stealth. 250rwkw in a GTT is a lot of fun :)

But please please look into your tyres/suspension/brakes as well.

Swaybars, do eeet! Cheap and fantastic handling upgrade - Whiteline.

Tyres, my car liked the KU36's, but alternatively i'd prob splash a few hundred more on some AD08's from tirerack

Brake cylinder stopper, check ebay, very cheap.

Check brakes over, bleed, put some good fluid in etc (RBF600)

But yeah, would be a good idea to check the spring rates if you can. Get some swaybars for sure though! :D

have fun

Listen to this!! +1

yep.. stock parts work the best in some cases.. that goes for FPR, BOV's etc

what if i continued using the hks bov and add a plumb back adapter to it? would it be better than stock bov?

will the sound still be loud? and will it be defected?

thanks

It will be still quite loud, louder than stock, being as it is shiny you will probably get incorrectly defected for it (it is legal if plumbed back) no matter how much you show them it is in fact plumbed back.

It won't be any better than stock for your goals.

The standard bov is a recirculating bov which means it is allowing some air out even off boost. In that way it is different to all aftermarket bovs. This means that the tune will have to cover this up. My tuner recommended keeping the factory bov as he said its easier to tune and normally ends up with a much nicer result.

  • 2 months later...

The standard bov is a recirculating bov which means it is allowing some air out even off boost. In that way it is different to all aftermarket bovs. This means that the tune will have to cover this up. My tuner recommended keeping the factory bov as he said its easier to tune and normally ends up with a much nicer result.

can you elaborate on this please?

can you elaborate on this please?

The stock bov is recirculating, as in it recirculates the air back to the intake and doesn't release it to atmosphere, though some does leak back out the air filter. If you have it vent to atmosphere it means the air is metered by the AFM, but is then vented to atmosphere, this means the car injects fuel for air that isn't there and hence runs rich when throttling off causing backfires and stalling issues. Also the stock bov leaks on vac and idle, essentially bypassing the turbo intake which is a restriction on vac which is a nice feature.

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