where and how much improvement?

 

I've been searching each week for CAIs for the 07 Sedan and haven't found a single one yet. Hopefully they'll be out soon.

 

yeah i've been checkin too and it taking way to long for the aftermarket to catch up. only thing you can really upgrade are springs and wheels at this point! i hope they dont wait for the coupe because we have a while til that comes out!

 

I doubt there would be much if any gains from an intake. with the dual runners, and the factory "cold air" ducting, you'd be hard pressed to gain anything from and aftermarket unit IMO, other than some noise. I would think that dual short ram intakes would probably cause turbulence at the MAF and cause it to read erratic, and would probably lower the power output. just my 2 cents.

 

I want a Supercharger!

 

Just get some of that spiked DAYTONA fuel

 

supercharger is nice, but just dont like the hood that has to go with it! ugh!

 

+1 I don't think many aftermarket companies have the engineering experience and R&D capabilities to get much if any gain over the factory job. Nissan did a very good job designing the intakes on this car.

 

+2. Same goes for the exhaust. 99% of the people who will attempt normally aspirated mods on the '07 will make the car slower. It's pretty much done.

Save your lunch money for boost. The motor is now built to reliably take moderate levels without any internal mods. Combined with the factory LSD, should be a rocket sled.

 

I want an exhaust just so I can here the engine a little, It's kinda of hard to judge the rpms by ear, and I don't like having to stare at the tach!

 

I think the CAI will cost more then it will be worth.

 

Hmm ... if I had $$, I might take that challenge. The stock exhaust is 2 into 1 back into 2. Switching to a true dual exhaust should provide some gains for N/A motors and would probably be required for a F/I motor. I wouldn't buy anything unless the manufacturer shows dyno comparisons.

 

Agreed..

 

I partially disagree, a certain level of back pressure at different places in the exhaust system will help create/tailor the torque curve - a straight through exhaust is usually not best for N/A engines.

I completely agree about the dyno before purchase of a new exhaust, I think it will be near impossible to gain more then a few HP with an exhaust(or intake for that matter).

 

I totally agree with Audiophile on this. Even though the exhaust may not look optimal for flow, there is a certain amount of back pressure designed in to make it deliver low end torque and the sound Infiniti was looking for.
I'm sure there are a few ponies to be found with smoother bends and and maybe an X-pipe, but I would think it's pretty well optimized from the factory.
An after market system might bring too much noise, resonance and droning for just a few more HP..