If you are trying to keep the car streetable, keep your compression at 9:1 and stay away from a huge turbo. I dont under stand your posts 4-banging You said he should run a 60-1 Garret turbo and 10:1 comp pistons, so what would be the point of NOT being able to run the boost that turbo is capable of by running a higher comp. piston. Second, he says he wants to run it on the street. So that turbo wont make power until very high in the power band. and by the time you are to full boost, you have to shift. Not to be a dick or anything but I just dont see what you are trying to do. Then you said he should run a race header, with a turbo:slap: You use an exhaust manifold and downpipe. As for the injectors, that is HUGE, WAY to big for the street, let alone a streetdriven 4 cylinder. We have a customer with a fully built 4G63T Galant, with a super 16G. He also has 550 cc injectors, and has bad fuel cut. This isnt because there is too little fuel, its cause theres way too MUCH fuel. It tells the computor teh combustion chamer is flooded, and then immediately leans it out. Those 720's are too big, and not only that, have fun filling up your tank every 150 miles. If you have reasons for your suggestions, please enlighten me.

Now, lets take the Volkswagon 1.8 liter turbo into consideration: in order for it to run a stock compression of 9:5:1, it needs three intake and two large exhaust valves to flow enough air for that high of compression with boost. For our heads to handle that much compression and boost setup, we would need a full race port, intake manifold, port matching, five angle valve job and port match of the exhaust manifold. This all sounds easy enough, BUT, the driveability and durability will be taken away when you port SOOO big, and give it a valve job to that extent. With a five angle, you get better flow then a three, but you shorten the life of your valve seals AND valves, which isnt too much fun to replace all the time. Even after doing all this, it still wont add up to the amount of flow you need to push boost and comp.
If you need any other suggestions, let me know