dual exhaust

True duals might be beneficial (I don't really know) but I'm guessing that simply using single in and dual out muffler and then splitting into two pipes might actually reduce backpressure, which may or may not effect torque.

I have true dual 2.5" custom exhaust. Helped out alot on top end. Here are some pictures.

for a custom fab job to be done in order to get the dual exhaust out the back, how much would that cost? jut gotta figure out how much money to pu away to save up for it

Depends on if you're paying for stainless or not...they charge by the foot. Just call your local exaust shop and ask.

so i've been searching on the forums for a couple days now to see if anyone has talked of or done anything similar to what i would like to do and seems as if a lot of people have a similar idea. I went to the local muffler shop today to figure out placement and cost for the full true dual exhaust.

It would run me 370 not including the mufflers for 2" pipes running straight from the cats into an H pipe, then into individual flowmaster 40 series mufflers which would need to be stood straight up next to each other to fit and then the pipes would be run out the drivers side.

Does anyone have any pictures/recomendations on that? I was hoping to run 2.5" pipes but was told they wouldn't fit, maybe if they were run on top of eachother? Any suggestions?

A well built single tube exhaust can flow more than enough for a 3.3 ltr. V-6.
Too big of exhaust and you loss the scavaging affect of the exhaust system.(loss in power)
More is not always better.
Now for turbos it's different not SC's though they need some back pressure as well.

Here is the beginning of mine:

Lookin' good Dagger! What headers are those?

SLR's

Where did you get the cats?

I got the cats and the muffler from Ebay. All are Magnaflow.

http://stores.ebay.com/Performance-Curve

The cats were $127 for the pair and the muffler was $86. All in stainless and free shipping.

Wow, you're gonna' love that..

Very nice!
Which X are you putting those on? Are you going to do the pipes too?

I just did mine up with a full dual and SLR headers, but I have no cats anymore. If I ever move I will have to plumb some back in. Here are a couple pictures... I just had a standard aluminized system done with two standard mufflers for about $300. Eventually I will probably need to do something different. It's freakin LOUD! Almost sounds like a stock car...LOL! Fun now scaring people, but it might get old... we'll see! I didn't get any good pictures, but here's a couple...





Checkout the crack on the bottom of my driver's side manifold! The top had a big crack too right next to the oxy sensor.



And all the parts that came off...



Honestly, I'm not sure I would do this again. I'm kind of wondering if I should have just had the dealer put a new manifold in. I mean, I spent about $1200 for the entire setup and it's probably too loud, it won't pass emissions, and I maybe got 10 HP (15 on the optimistic end) out of it over my stock setup with Gibson. Oh, and there's still a leak somewhere...ugh! Not that it's bad, just that the performance to dollar value isn't all that great, IMO.

I will say that the engine revs quite a bit more easily. I can run it all the way up to redline without it running out of breathe... just keeps pulling in the upper end.

It is going on the yellow X. While it would be a lot of fun to put it on the SC, blue X, with only 25k on it, the exhaust is still like new.

My plan is to do all the pipes in stainless.

[QUOTE]Originally posted by ChuckH:
Honestly, I'm not sure I would do this again. I'm kind of wondering if I should have just had the dealer put a new manifold in. I mean, I spent about $1200 for the entire setup and it's probably too loud, it won't pass emissions, and I maybe got 10 HP (15 on the optimistic end) out of it over my stock setup with Gibson. Oh, and there's still a leak somewhere...ugh! Not that it's bad, just that the performance to dollar value isn't all that great, IMO.

I know what you mean. I'm not expecting great gains. I got the headers cheap from a guy who bought them and then never installed them. Then again, It would cost me more from the dealer. Nissan wants $495 per cat, and mine are shot.

We have emmissions tests in NYS so I will make mine legal. Not sure if you can see it, but the cats already have O2 bungs built in. I will just have to weld in a nut on the downtubes to plumb in the EGR system.

Would anything have to be different for the SC?

I would probably use the same setup with the SC.

[QUOTE]Originally posted by Daggerdoggie:

Check your PM's

Checked and replied!

Its a question of limiting factors.

If a part is a limiting factor, then changing/modifying it can improve performance.

The 2.25" pipes coming out of the X are slightly limiting...a 2.5" pipe is not...the X just can't flow enough air to overwhelm its capacity.

If the X can't flow enough air to overwhelm a 2.5" pipe...two 2.5" pipes won't improve anything, as its no longer addressing a limiting factor.

I swapped out the 2.25" pipes from the cross over back to 2.5" SS....and moved the muffler to the butt of the truck, and went to a smaller Magnaflow SUV with pretty much no resistance compared to the giant honkin OEM monstrosity.....

I did it to make room for a 4 gallon air tank where the muffler used to be.

I have the muffler tucked into the well the spare used to partially occupy, but the exhaust tip is just under the shrock...and, when coming down off of rocks...the tip does get somewhat oval to cresent shaped, as its squeezed between the bumper/rock, etc...

(Easy to pop back though, just unsquish it with two wrenches scissored inside the tip, etc...)

Some people noted a loss in mpg when going to less restrictive exhausts....as the exhaust scavaging pulses are interferred with when you change the exhaust/lower back pressure, etc.

As my header to cross over pipes are still limiting...my mpg stayed the same...If I had new intake, plumbing and headers etc...then I'd probably see a difference in both performance and mpg....after all, if you are using more air, you are using more gas to keep the same ratio.



I saw no change in performance, but, I did notice it sounded richer and deeper, and initially, I thought it had more power, but I have one of those meters, checked, and it didn't...the noise just made it seem that way.

i had a half-ass dual exhaust on my 1997 nissan pickup. (single input muffler, dual output). I put a Supertrapp on each side to adjust the scavenging. It sounded pretty good, but no perfomance gains of course. (little 4 cyl). I eventually went to a single with a Supertrapp which offered the best of both sides.