MAC is the only company I know of that currently makes long tube headers for the GTs. Maybe Sean Hyland also. But if go that route it comes with a H-pipe.
As far 12s. A set of 4.10s + long tubes + your DR would probably get you there, or least pretty darn close. While you are doing gears, you should probably get a set of subframe connecters also.
BTW, what was the trap speed for your 13.5?
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AIM: Some97Snake
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