thanks for looking, and it would be about 1.5k or just under on the engine and exhaust was about 800 i think, i did all of my mace stuff at once so i cant tell you about the TB in particular but the gains i felt after were alot better than stock and it helps it breath and feels more punchy.
With the dual one ive heard mixed stories so im not sure sorry, if it was cammed id say it would help but if you want forced induction it may make things harder. Sorry i cant give a def answer
If you do get it i'll def read about it to find out