I have a RHD 1st gen with a 13b 4 port. I want replce this with a S5 TII eng. Should i do a TII eng with a haltech or a blowthrough system? I'm selling my current drivetrain 3k on it since rebuild with a large streeport/holley setup RB streetport exhaust. I will be rebilding the engine myself. I have all the engine parts and a S5 TII tranny in my garage.. What do you guys think?