F.I.
Motordyne
AAM
Tanabe
Meisterschaft
Tomei
5Zigen
Plus a lot more... They all use different designs. What type of resonators you put on, where, where your X or H Pipe is, pipe diameter, merge points, etc. That knockoff product copied someone elses successful work and Hired a China company to build it.
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Old Car:GTM TSC'd 550whp / 410lbft tq @ 11.88PSI
New Car: Under Construction
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