because you have a Titanium exhaust, check out Thaitanium, En makes a dual resonated titanium y pipe. I"m not sure what the cost is. He also can make it in stainless steel as a cheaper option.
Hall Built Performance is another guy that can make a dual resonated y pipe. I believe his is about $450.
Motordyne is the other mainstream option for resonated y pipes.
other than that, ISR is popular because of cost and its also has 2.75" primaries compared to the standard 2.5" in all other y pipes.
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RHM 75mm TB & ported up/low mani., 3" intakes/velocity stack, Z1 Headers, Motordyne ART pipes, HBP 3.5" exhaust, Tein MonoSport, SPL F/R arms, endlinks, and tie rods , Eibach sways, Z1 rotors F/R, diff bush., subframe collar, Bell Raceworks diff brace
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