[VinnyV81]

Thanks for the response!

So, I could run stock 550 primary and 1,000 secondaries? I think that's what most people do. And yes you are correct, I don't have a wideband yet but will definitely have one when it's all said and done.

I have looked at BNR's website and they're stuff looks impressive, but it's also really expensive. I mean it is a stock turbo after all. For what they charge for a Stage III, I could buy a brand new Garrett or the like. Plus, most stock S5 turbo manifolds have cracks in them and people want an arm and a leg for them also. This was just looking through ebay and the forums.

The engine is very healthy. Car has great power now for it to be NA and half way tuned without a wideband yet. I believe the engine only has around 50,000 miles and was rebuilt by Rotary Performance of Texas way back in like the late 90's.

The real question is how much boost can I run on pump gas? I have heard 7 or 8 psi was the max. I have access to E85 so if I run that I will need even larger injectors and the ability to switch tunes on the fly.

What about turbo manifolds? It appears that a divided flange T4 setup would give better response down low. Is there a source for an aftermarket one if I choose not to go with a stock unit?