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1992 740 Turbo does not use the preheater function.
However, a unique filter is specified each for either normally aspired (non-turbo) and turbo air filter. See the FCP Euro, iPd and like sites. Dunno whether these are of different size. Yet considering the different in air mass consumed between NA and Turbo, you'll want a Turbo filter. Also, dunno or I forget whether the Turbo air filter box provides some manner of support so the air filter does not collapse.
The factory installed Turbo air filter box does not have a port for preheater function. The turbo manifold does not have a preheater shroud to make connection for preheated air from the Turbo exhaust manifold.
For more research, search here on the issue. Your better be searching and asking at Turbobricks. Some info requires a Turbobricks login account.
Not a cone filter fan myself. The oil-basted filter allows oil to draw in past the AMM / MAF
On my 240s, all normally aspried and aspired (ha!), I removed the air flapper preheater valve, removed the preheat hose, and so the air filter box is a cold air intake with very slightly improved throttle response, on a 3400-lb 240 with a 114 HP factory stock engine on a good day. So not Turbo.
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