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First off, you should really consider the 6MT. They have been known to run 14.3-14.1 bone stock with good drivers.
As for the Automatic, you're about right. High, sometimes mid 14's stock. Trap speeds seem to be ~94-95 MPH stock for an Automatic, and ~97 MPH for stock 6-speeds.
For the VQ35DE cars (02+), ypipes are useless. While they are the best bang for the buck on 4th gens, Headers are really the only way to go with a VQ35, the reason being that Nissan didn't make the exhaust system bigger for the bigger motor, so it's much more restrictive on the 3.5. Headers alone (good ones), should give you 25WHP on a VQ35.
As for automatics. There is a 2002 Auto that runs 13.81@100.5MPH with headers, a few bolt ons and a Valve Body mod.
One thing you have to keep in mind though is that 1/4 mile times are not very representative of everyday driving, because of AWD. So, a stock WRX runs 14.3-14.4 at about 94 mph and my car (stock 95 5-speed) runs 15.0, at 91 mph, yet on the highway I am dead even with a WRX. This is due to FWD, since I couldn't manage anything better than a 2.26 60' in my stock car, while a WRX probably wouldn't have a problem with sub 2-second 60's.
Even trap speeds are not representative of that. On the highway, I would rather drive a VQ35-powered maxima trapping 100-101 mph, than a STI trapping 104.
I will even speculate that a low 14/high 13 VQ35 maxima will be just as fun to drive in everyday traffic as a low 13-second WRX.
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