Ok guys just trying to brain storm the last couple of days. Why is the 84-85 gn's slower then the 86-87 gn's? One of the major factors I think is the intercooler but there is a simple fix to this. Running a Alky kit pretty much eliminates the need for a intercooler. I know the intercooler still cools the air more and then if they inject alky on top of that it will cool even more but im pretty sure with us spraying alky on our hotair cars we are making a huge difference in intake air temps and is putting us close to the air temps if not cooler then the stock 87 intercooler. With this being said lets move on to the rest of the motor. Another factor and I think this is the biggest one of all is the intake. The stock intake sucks period. Yes it was designed for alky injection but it still sucks. If you put the 84 intake next to the 87 intake there is a major difference that you can see. I currently have my intake gutted and ported and im about to send it off and have more work done to it because I know there is more room for improvement. If you think about the design of the 2 intakes clearly the 87 intake is better designed but we are limited to where the turbo is located and how it feeds the air intake the intake. I messured last night from where the turbo seats to where the bottom of my intake plate is and its 2 1/8 inches. So once the air leaves the turbo is pretty much hitting a flat surface. If you think about how the air is disturbed right there going into the intake that’s a big deal. The 87 intake comes right threw the throttle body and has a nice curve on the plenum into a nice big open intake. As far as the long block it’s the same as the 87 with a few minor casting differences. The heads are the same as well. Now lets move to the turbo. We can get turbos pretty much as big as we need and will support us to the low 10’s but im not going to get into that. Lets talk downpipes. Mease made a 3inch dp and you can get 2 ½ dp so that is not a factor but there is a little difference in the bends of the dp but that not going to make a difference. Lets talk headers. Poston and ATR made good headers for our cars so thats not a factor except maybe spool up since we have to use a up-pipe to connect to the turbo but atr and other companys make good up-pipes. Lets talk the air inlet. There are cold air kits with big inlets so that’s not a factor in my eyes. Ok lets talk throttle bodies we can get 62mm tb for our cars and the 87s have been in the 9’s with 62mm tb. So what does all this come down to. I think it comes down to the intake. Just wondering what you all think. Right now I ran 12.6 @107 with a 1.68 60 and I didn’t get to do any tunning. I think I could have run 11.99 on the stock heads but I wont know now that I lifted a head and im going with different heads. Please let me know what you all think on this topic.