[Bogart]

So I've decided to go the twin turbo route on my 87 GT, using Incon headers if I can.

Is it unrealistic to expect to be able to retain all the stock accessories including the A/C with such a setup?

[Gro_oms]

I'm not for sure b/c I'm a noob, but in mm&ff a 94-98 cobra had a TT and he had to yank out the A/C to fit it in. For that kinda power though its worth it, his car was a Daily Driver and put down 1020 RWHP. INSANE. He said it was worthles 1-3 full throttle because it would go sideways.

[GTRaptor]

If you use incon headers, which will be hard to find, you can retain all the accesories.

But you have other options, there are many trubo manufacturers, some with good reputation.
Visit TurboMustangs.com, they have a long list of suppliers with reviews on each. And one more thing, dont settle on a twin setup, single setups can be "friendlier" in many ways, tunning, install, maintenance, and will offer the same kind of power. And dont worry about LAG with a single setup, its all in the Turbo you select, and V8s provide enough exhaust flow to reduce lag to a minumum.