howdydoo altimas.net defectors!
Bolt ons for the 2.5...
CAI (Injen, Hotshot, AEM)
WAI (SWA, Stillen)
Header (Stillen, Hotshot)
Catback Exhaust (Mossy)
If you're gonna get a header, go for Hotshot. It may not give you the gains of the Stillen, but you'll have far less headaches. Why? Because the Hotshot header replaces ONLY the header, and not the downpipe where the secondary cat resides on. That's why Stillen will more than likely net you bigger gains... but you'll eventually have to go through the hassle of getting an aftermarket cat once your smog inspection comes up. Plus, after seeing both the Hothsot header and the STillen header in person, the welds and build quality simply look MUCH better on the hotshot.
CAI? I like the Injen more purely for aesthetics... actual performance differences between the three I woudl think are negligible since they're all 3" pipes with almost the same bends.
Catback Exhaust? I would get the Mossy one if Greg didn't plan on making the muffler tip stick out damn near an inch from the bumper just so everyone can see the "Mossy Performance" sticker on top of the tip... I like the tip tucked, not sticking out waiting for haters to step down on it.
Muffler? Don't waste $350 on a muffler... unless you REeEeeEALLY like the way it looks, a muffler alone wont do much in terms of performance.
oh yea... the UDPs for the Spec-V will work...
Also.. you can remove the balance shaft of the QR25DE to free up 9-10whp. Refer to the Performance forum over at B15Sentra.net for complete instructions and more information. It can be done for free, or with a Jim Wolf Technologies kit that sells for $89.
Trav0141 is also near completion of the turbo for the Spec-V... which means it "may" work for our 2.5 Altimas... but since the engine bays are so different, it would require some custom work...
Anyways, that's all I know for now... will keep ya'll updated if I find out more.