You don't "need" to use a sigcon unit... however I would ask this guy if the smartbox has a stand alone MAP sensor. You will be needing one of these. If it doesnt have one, you'd best look into getting one too.
You'll get virtually no adjustment in fuelling if you try and use the standard MAP sensor.
In the early days, I ran my turbo conversion on a Dastek with integrated MAP sensor... no other gadgets, and it was pretty cool!
Simo'
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