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</span><table border="0" align="center" width="95%" cellpadding="3" cellspacing="1"><tr><td>Quote </td></tr><tr><td id="QUOTE">Quote: from jay on 9:30 am on Nov. 28, 2001
Is the N1 dual or the single better? I like the look of the dual but I want performance to be my first concern. Also what is the difference in HP gain between the 5-Zigen and the Apexi N1 series? I know that the Apexi has like 3.5 inch
piping, is that for N/A or is that the turbo version? I know that some amount of back-pressure is a good thing and that is why the 2.5 inch 5-Zigen system seems better. But you guys would know better than I would and that is why I am asking. Thanks for any help or advice you guys can give.
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Backpressure making torque is a myth. For the maximum amount of power, get a custom tuned header and dumps the exhaust gas out the side of the car right after the collector. But since I’m assuming you drive this on the street you are going to have to be legal. Street exhausts will all allow about the same amount of power. Running a giant Apexi GT with 3.75” piping on an N/A car wouldn’t make too much sense, but I doubt you will see a giant spike in power loss as claimed by many people. 2-2.5 is the ideal size for the big 2.4 liter in the 240sx. BTW I believe the dual is N/A.:)
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