In-line AC filter
 

Can anyone point me to where I can find an add-on inline highside filter that will bolt on. 86 16v. I really don't want to have to cut lines but if that's not too bad I'd like to hear that too. I know some come with compression fittings but are they reliable?

Here's one place: http://www.ackits.com/index.cfm?fuseaction=Inline
I'm sure there are many more. Every filter I've installed required cutting a line, except for certain Cadillacs that had available a replacement liquid line with the filter built in.