Get a Turbo Back.
Turbo Back runs all the way from the turbo to the back of the car.
Boost will come on quicker, you will have a nice top end gain, and you will get some sweet spool noise.
I have one of the new ones without the hole on my S14, and it boosts full boost (12psi) instantly on gear changes. I mean instant. The needle just flies back up to 12 when you put your foot down.