The closest match fitting (but not plug and play) would be the 4G93 cylinder head. For 4G92 a little work needs to be done to port match the intake ports. Both intakes needs some minor work to fit on the head. Gasket wise you have to custom-cut accordingly.
If i decide to go for the upgrade, i think i would choose the Skunk2 intake manifold together with the biggest throttlebody from Skunk2 which is the 74mm. With the mass "Skunk2" other version (ahem) out in the market, they are awfully cheap and i think i would not want to take the risk especially if i want to port match to 74mm. There are chances the intake might crack during the porting. Why so big if you asked? If i plan to do this right i might as well spend a bit more and get the 74mm and have more "space" for my future upgrade than upgrading/spending twice. But it is not a must if you want to have a plug and play 70mm which is not an issue as long you know your future mods list. 63mm to 70mm is a big upgrade and going 74mm you will start to hear another person breathing under your hood. A piggyback would be compulsary by now by the way.
What about ITBs? There is nothing wrong going the ITBs way as long i have an EMS. EMS is very important if you plan to run ITBs. Having a piggyback aint gonna fulfill your dreams and you will not get the 100% true response and power from the ITBs. You need to get your chosen tuner to tune it well or else you will automatically be added to the all time statistic which is "ITBS, hard to tune".
When it comes to intake manifold, throttlebodies and ITBs, there is no "right" size since it does not state on a piece of sticker with "20whp" when you buy the item. Size, length and tuning will take time and dependable on your healthy engine and also the mods you have done.
If you crave for power, skip this post and swap your displacement to at least 200cc or 400cc more. Swapping intakes or ITBs will not make as much power as swapping blocks and internals.
Those hardcore drivers are going for oversized intake manifold like the ones you used for a turbocharged cars just to get as much air to their massive setup. There are huge and probably running nothing less than a 80mm single throttlebody.
Here are some sample photos i found online and i am imagining it on my car. Hehe.
There is no dilemma actually. If you know your budget, you know which way to go. In my case, let me sleep on it and see what i decide soon.
Mivek4doddle
