I'm building up my engine next spring but, wanted to get a few basic parts now. One of which was an Apexi N-1 catback. My car will be turboed next spring so I figured on getting the 3 inch piping. How will that affect my n\a performance? Should I get the gst option?
Will I need a flange or couplink to link the 3 inch piping to smaller stock pipe. (I own a 99gs)

it would be wiser if you know your going turbo to go ahead and get the 3" piping. youll want the GST N1 because the GSX is different and will not fit. in N/A form 3" will hurt performance, but since youll be turbo'd later it wont be that big of a deal. im pretty sure you can bolt up the larger pipe to stock...a few people have done it

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2011 Nissan Xterra Pro-4x

2007 Kawasaki Ninja 650R

1996 Mitsubishi Eclipse RS-NX 75 shot, AEM CAI, P&P t/b and intake mani-SOLD

1964 Buick Electra 225-all original, all power options, 325hp, 445ft/lbs tq