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I recently bought a very nice '87 GN and although I was pleasantly surprised at how hard this car pulls, I would like to go even faster. What mods do you guys suggest i do for under $1000, and how much faster will that make my car? I'm pretending that my car is pure stock even though its not just because I dont know exactly what I have to work with.

I also have a question about knocking. Especially on hotter days, my GN starts to make a loud knock/popping noise at around 9psi of boost. Someone suggested that my turbo was leaking oil into the intake and that was causing the detonation but I've read a lot about knocking due to a less-than-sufficient fuel pump? I also experience a good amount of stumbling at higher rpm's, probably due to retard. Let me know whatchya think.
 

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Take it to Cotton's Performance in Mass. or do a search on knock.

You have a lot of work to do. Fuel system upgrades and some spring cleaning another good search title.

Good luck.
 
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