Can I swap my auto 1994 3000gt sl into a manual trans

Absolutely. As far as boost is concerned the 3si forum has a parts list and step by step guide. It's called the "NA to TT conversion bible". Its a great place to source parts as well, as many vr4 owners upgrade from their stock components. If you shop around and are somewhat competent as a mechanic you'll be into it for around $2000-$2500. Having completed the manual swap myself it isn't too bad. Parts collection without a donor car would be quite a headache. Many parts for the platform are no longer in production so I wouldn't even attempt to swap transmissions without a donor vehicle. Drilling out the firewall for the clutch master cylinder is also annoying unless the dashboard is out but that's another can of worms. Ultimately it will cost more to convert your SL than to buy a vr4. Unless you have serious sentimental value with that particular car IMO just maintain and enjoy your car. Save money, sell your SL and buy a vr4. The vr4 will come with other benefits beyond your conversion as well. Stronger engine (4 bolt mains), stronger driveline, Awd, better brakes ect. Either way good luck!

Thanks for the advice I was considering the conversion because I wanted to put a bigger engine in it Nd it’s never as fun if it’s a automatic lol, but I will take your advice in consideration and sell my SL, thanks