Gen3 GT3071R build

HG - since you have Gen3, no need to change gasket. Stocker is metal & tough. Factory head bolts should be ok for now.

Is your timing belt due for replacement & how many kms since it was done? Only change it if due (or over).

Intercooler, I'd go for a trunk mount or W2A. A sidemount won't do that turbo justice. Will surely rob power.

EMS - Power FC or Haltech IMO.

Fuel pump, do you already have a Supra pump installed? If so, leave it. If not, go for one of the newer Walbro etc units.

Cams, GSC is fine. 264 or 272.

Intake manifold - definitely do it. More beneficial by way of even flow/safety rather than spool. Standard manifold has uneven flow which can be dangerous or require compensation to be safe.

Got a pic of your Gen3? Be cool to it with the Simmonds.

Here is a picture. She is a little lower and faded since this photo.

I think ill jump on this too... 
 
with the water to air intercooler setup, you wont have to lose your spare tyre, just dont run the lines through there, as really there isnt really a need to anyway.
I went from side mount to w/a and the difference is huge, on the dyno as dylmrt said, intake temps are crazy, i think mine were around the 60-70 degree mark. W/a has kept it around the 35 degree mark on consequetive dyno pulls.
 
As for ecu, people do use the apexi and haltech, but I can't go past the adaptronic as the features and even the support behind the units is second to none, and have got my car running 10x better then a haltech.
 
as for cams, i have a set of 274 cams in my gen 2 engine, and have been very happy with it thus far.
 
Alex

Not much can really fail with a W2A system. There's really no sacrifice (certainly not with the frunk). Mine's been doing perfectly for the past few years. No affect on coolant temps either with the heat exchanger up front. The only potential fail item is the water pump (most use bosch) & they're actually marine grade & I've yet to see one die on a W2A setup (a few of us are running similar setups). Many have tried fancy shrouds, water sprays etc etc for SMIC's, but the reality is, it's just too small & in a bad place (near the dump pipe). If you're in Sydney, I can put you in touch with someone to do the W2A cooler for you (they did mine & a few others too). If you go the RacerX route, you don't have to get a reservoir (I'm not running one - no probs).
 
I really wouldn't change the HG or head studs at this point, nor the timing belt if it isn't due/suspect. It is a good idea with Gen2's as they don't have a MLS gasket from factory, but you're fortunate & have a Gen3.
 
As for the ECU, try Dylan or poke around the forums/ebay for a Power FC. They're probably the cheapest proven option (if not a bit dated), but combined with a handcontroller, they're quite a good ecu. Great for driveability, installation (plug n play), price, monitoring (via HC), just not flexible like the newer breed (no flex sensor potential, knock response etc etc). If not going that route, I simply recommend Haltech because the best tuners I know take preference to it. Hitman (arguably best MR2 tuner out there) works for Haltech. Guys like GAS & PowerTune all love using them. In fairness, you wouldn't go wrong with a Vipec, Adaptronic, Motec or Autronic as an alternative, but I just take preference to Haltech. STAY AWAY FROM WOLF!
 
Btw, nice SW20! I think I remember that one when it was up for sale in ACT.

Well with this advice i might just order the W2A kit+intake manifold from RacerX, Cams and Fuel pump. And drive it on the factory computer. Then around Christmas get a Haltech and injectors and do the tuning then.

Fuel system is completely stock, so just the gen3 540cc injectors.
 
Well if i don't spend this money now, im tempted to buy myself another motorbike.... :P