Qwertyco

iTrader: (2)

Converting a '99 Legacy Twin Turbo GTB (280hp) to a single turbo, so one thing I need is an exhaust manifold.
I'm aiming for 350hp with suitable mods, so which manifold would do the job, at the least expense:
1. Standard WRX:
http://www.ebay.co.uk/itm/subaru-imp...item460c80f802
+ an up pipe.

2. Another standard type:
http://www.ebay.co.uk/itm/SUBARU-IMP...item2c69a61952

3. Aftermarket type:
http://www.ebay.co.uk/itm/subaru-imp...item19d8cbc066

I'm looking for an early spooling setup.

Any opinions or advice out there?

Qwertyco

iTrader: (2)

Scoobynet, with no opinions!

am I on the wrong forum?

legacy_gtb

iTrader: (3)

for that power, your best bet is a standard harvey ported manifold and up pipe.

Speak to Alyn at asperformance as harveys sadly no longer with us and i know alyns taken over supply of his trick up pipes.

Infected by sti

iTrader: (6)

Or slap a twinscroll on it

Qwertyco

iTrader: (2)

So is the Harvey manifold a standard Item with his magic worked on it, plus his special up-pipe?

That had crossed my mind, but it sounds like a more complicated/expensive route, even if the results are better.
The Later twin scroll Legacy's have a massive low down torque curve.