gillyz20let

im thinking of upgrading my turbo to a 18-20g turbo.

at the moment i have the folllowing

prodrive cat d.pipe
2.75" milltek
3 port solinoid
k&n panel
ecutek remap
walbro pump
ported headers

what else would i need to make around 370-380bhp

500

What car is it??

gillyz20let

05 sti.

gillyz20let

anyone?

500

I'd speak to the mapper, but possibly some bigger injectors too.

gillyz20let

would it make the power on stock ported manifold or would i need tubular?

silent running

Bigger injectors are the first thing that spring to mind. Not sure what the newer Scoobs like yours run as standard but if your target is 370bhp, then you're looking at running 550cc/min injectors at fairly high duty cycles IIRC. Or at lower IDC if you fit an adjustable fuel pressure regulator.

ScoobyDoo69

iTrader: (17)

05 sti has 550s IIRC

500

Keep the standard ported headers for torque, or tubular for all top end.

personally, I would rather have the torque

Makes for a much more driveable car.

RLE

iTrader: (2)

View my scoob for details of mods on the 18G.
Injectors/ top mount fine for your figures but highly recommend the K&N 80mm Induction rather than the straight forward panel.

Barnesy

I'm in a similar position to you with an 03 sti, so far I've got:

3 inch full decat
APS induction with cold air feed
20g turbo.
Uprated fuel pump

Looking at getting:

Gt spec headers
Turbo blanket
Apexi Avcr
Andy F remap.

harvey

iTrader: (48)

Properly ported headers and matched up-pipe can go well beyond your target power output and give the advantage of noticably earlier spool and torque.