to confirm its an 1990 gt4 st185, me and my dad went halfers on the car, its got very low boost pressure and white smoke, not sure what our long term plans are with the car as im off to the army in 2 months, me an my dad have agreed that the car will need this problem sorted even if we decide to sell it. its currently ny daily driver we dont want to be spending alot of cash on it hence why were looking for a 2nd hand unit