Apexi GT Spec for sure! My little bro has one on his sr20 and it sounds great. Plus it is full stainless steel, unlike a lot of Greddy, or HKS's exhausts for 240s that are mild steel. It is 80mm (3in.) until the resonator, then it is 97mm (4in). Plus the guys over at Apexi are good stuff. If you want to go with anything Apexi I can get you a good deal through my shop. E-mail if interested. 
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1995 240sx SE RB26dett, JE pistons .5mm over, HKS GT2510 turbos, OS Gieken twin plate clutch, HKS 720cc injectors, Aeromotive FPR, Greddy intercooler, custom 3" aluminum piping, Mines dump pipes, Custom Horstman downpipes, Greddy 4" cat back, Greddy Profec e-01, Greddy e-manage, Recaro leather SPG seats, 300zx brake upgrade, Aeromotive tsunami fuel pump, koyo aluminum radiator, energy suspension master set, And one REALLY f*&%#@! good ALARM SYSTEM
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