You are really not missing much man, if anything at all. I gained 30whp with a full exhaust and LTH's. I gained hp everywhere, even down low. I would just stick with it. You have options with that Y pipe. The Tanabe is an awesome Y pipe, but it's also $500. $150 more for 1/4"... Think about it.
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Old Car:GTM TSC'd 550whp / 410lbft tq @ 11.88PSI
New Car: Under Construction

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