1994 Subaru SVX project

[CalvinSVX]

My Dad and I purchased a 1994 Barcelona red SVX. We have a ton of questions that we are reaching out to people to answer for us. Firstly we want to convert it to a manual ideally a six speed. Which six speed can work and where do you get it. Secondly we are thinking about putting air suspension on the car instead of traditional coilovers. If anyone knows any brands that make ones that work that would be greatly appreciated. Thirdly we would like to know what exhaust system is the best for this car, we plan on making custom headers but not sure what exhaust to use. We would also like to know what differential you can use for the six speed conversion. Now our SVX is interesting because its an LS and those were available with the two wheel front wheel drive option. Our SVX sadly has it so we have to do a rear sub-frame swap for four wheel drive. If you guys have any info for our project it would be much appreciated. Thanks