I just took a look under the X. That exhaust on the SC model is rediculous!! The decreased diameter bends are only 1.75 in diameter and the tubing looks to be only 2". That's rediculous for a V6 trying to expel all that exhaust. Boy can I feel the restriction up in the high RPM's. That exhaust needs to be replaced from the pre-cats back!!! I am definitely getting the SLR headers which get rid of the pre-cats, then I'm going to have some custom piping mandrel bent to handle those gasses!!! I am thinking of a dual exhaust. It definitely looks doable if I run the 2 tubes directly beside each other and get 2 lo-pro racing mufflers. The exhaust is especially a mess where the 2 manifold pipes join together to run to the HUGE muffler under there. I can't believe they would put an exhaust for a 4 banger on a supercharged V6!!!!!!!!
I just ordered the K&N 63-1052. Just the start of my getting this truck to the 250 hp range. Stay tuned... I'll post some pre and post install dyno numbers. I can't wait to get this truck breathing (and farting) easier.

Be sure to let us know when you have pics for that and what was the price on that K&N 63-1052?
Also what do you have or plan on putting on for air intake. I want to replace both so am looking for opinions.

The 63-1052 is the whole air charger kit. I got it at 4filters.com for $244.72 FREE SHIPPING. I was ranting earlier about how little you get for that much money, but no-one sold just the parts only to do the whole job, so I caved. As far as the exhaust, I'm going to go 2.25" dual or a 2.5" single. I have to get with our exhaust guy that did the work for our SCCA car. I will be doing a whole documentary on everything we do to "Project XTERROR".

hope you have better luck with the headers then I did.

Hmmm.....I'm starting to reconsider with all the bad press I'm reading about SLR. Sucks there's only one company making headers. Maybe make my own!!!

Make sure you keep us posted...inquiring minds want to know!

Are you putting 2 cats on if you make it dual? Would a high flow cat increase performance?

I'm looking to replace the headers at some point. Was going to go with SLR, but in reading some posts here...they don't deserve the $$$. Those headers remove the pre-cats. For right now I'm just looking to hack the system right after the secondary cat, then do the rest. There is a BIG issue with the way the system is designed after the cats. In my experience, high flow cats do improve the flow of exhaust. Nothing like removing them all together. I could only do that in my '00 Honda because I was running a chipped ecu which ran the car without the cat conv. input signal.

Are you going to do anything with the ignition?

not sure if it's the same on the X as it is on my Mustang - however I just had SS highflow cats put on w/ an cross over pipe" . The shop recomennded doing a "MIL eliminator" to slow down the signal to the ECU so that it would not give you Check Engine lights after the install. I have a lot done to the car and I have no issues so far.....however it's not my Xterra so I'm not sure if it applies here or not

just my .02

Hey emt. I have a GT 5.0 Stang as well. Got any pics of your beast?

I'm reading all these posts about HP increases to ridiculous amounts..
I don't think Pilot will get 40HP just with exhaust..dual or not..
Very unlikely.
I gained 19HP on my 5.0 with FULL exhaust , Intake, pullies and Cold Air..and that's on a 5.0 Stang.

I used to have a 240sx and I did lot's of exhaust research. I have read articles in Sport Compact Car where they used high flow cats and they didn't see any horsepower gain on a Dyno. It is just a way to get more money out of the ricers. They don't increase performance.

[/qb][/QUOTE]Hey emt. I have a GT 5.0 Stang as well. Got any pics of your beast?

I'm reading all these posts about HP increases to ridiculous amounts..
I don't think Pilot will get 40HP just with exhaust..dual or not..
Very unlikely.
I gained 19HP on my 5.0 with FULL exhaust , Intake, pullies and Cold Air..and that's on a 5.0 Stang.[/QB][/QUOTE]

It may be that the exhaust you had was almost up to par. I'm doing intake, exhaust and probably headers....that combo releasing all the pent up supercharged gasses should yield at least 40 hp at the crank. Did you gain 19 WHP or 19 CHP??

what would that mean at the rear wheels?

There are 2 ways to measure power. Power at the flywheel, or true power (power that your putting to the pavement) which is calculated by subtracting an estimated drivetrain loss. With front drives it is usually 15-20%. With rear drives it can be 25-35%. Wheels and tires also take away power- like those big ass 23"ers that weigh 50 plus pounds!!! I've even seen 17 and 18 inch wheels weighing that much!!! "At the rear wheels" means true power to the pavement.

edit: Nissan's 210 HP is rated at the flywheel.

My GT has full exhaust mods:
That means.. Headers on back, including mufflers. Everything is Hi Flo.
Including Intake swap.....plus pullies.
Just to say..If I had every HP for every mod as advertised by mod part manufacturer..I'd be running 500 Ponies easily.
Visit my webpage to see if you like the mod list and cool pics.
Anyway...if you get 40HP on doing exhaust and intake on your X..
I'll be impressed..
but won't you risk screwing up the computer and SC with that much air flow change going through?

40 Flywheel HP is hopefull. I'm banking on the lackluster stock setup being removed unleashing the pent up gasses. I'm working on fixing the computer issue. I'm trying to get a manufacturer we deal with for imports to develop a system that will piggy back the stock ecu. I've found with tuning Hondas that stock ignition timing tweaking can help as much as 10 HP to the ground. I don't think the airflow change will be enough to hinder anything. The stock ecu seems to be rich anyway with how much carbon is on the tailpipe. The ecu will also compensate for the the slight change that will occur. Boy, I wish I had the gusto to do headwork and all. There just is not enough aftermarket support to do it properly yet.

Ya that for sure about not enuf aftermarket products out there..
Well good luck bud.. the truck can definitely use the extra power.
As for me...I can't afford to start on the truck in that mod fashion. I guess I'm stuck playing with the 5.0 Litre .
Later buddy

Me too Will you see a gain? Probably. 40 hp...um no.