A Good Reaason for Aftermarket Exhaust

[Cajun]

Attached are pics of the Stock Y pipe. The restriction is sickening. I copied a system shown here on a different thread. Cut both pipes after the cats, welded 2.25 tubing to the X-Pipe, the 2.25 tubing to a Flowmaster 70 series 2.25 dual in and 2.25 dual out. Quite an improvement...PerformancePeddler.com sold the X-Pipe for less than $70.00 delivered, the Flowmaster for $122.00 delivered, the exhaust guy charged me $120.00..I used the dual Stainless tips from my HarleyDavidson F150,,,,finished out very neat..
DT

[Scarab]

What is the part number on the x-pipe? I am interested in doing the same thing. Do you have pics of the new x-pipe?

[1BadTitan]

I'm doin that!!!

[Tony]

Is there any logical reason for the imbalance in the cross sectional area between pipes? Scavenging?
Kind of hard to believe the acceptable tolerance on the pipe dia. could be that sloppy.
Looks as though 4 cylinders are being choked off!

[Cajun]

There is no logical reason for half of the exhaust flow to be blocked, except for shoddy workmanship. I have built racing outboards for 15 years and ALL internal combustion engines, 2 stroke and 4 stroke, operate on the same principal, air flow in and air flow out produces power. Sorry, I don't have a picture of the new X-Pipe, you could most likely find it on Magnaflow's web site. The X-Pipe is a Magnaflow Product Model Number MAG10790
The muffler is a Flowmaster Big Block 70 Series dual 2.25 inch inlets and dual 2.25 inch outlets. Magnaflow part number 524704. PerformancePeddler.com has the best prices I could find. A pleasure to deal with.....What a difference by allowing the engine to breathe a bit. Not much louder than stock, gotta love that Flowmaster rumble. And if I say it is not too loud,,,,I am over 50 years young, still a kid at heart.
DT

[Tim Sloper]

I would suggest anyone doing custom exhaust work to pay very close attention to the type of bends being used in the new piping. Anything you do should be mandrel bent only! 99% of the exhaust shops out there cannot do this type of bend. You will typically see them produce a smooth bend but if you look closely you will realize they just took a 2.25" pipe and reduced its cross-sectional area to something much less than 2.25". A mandrel bend would be 2.25" all the way. It's frustrating to see people pay alot of $ for custom exhaust work on this board only to find out the system was not done with mandrel bends.

Tim

[titanwild]

Tim is dead-on about the pipe bends. Look long and hard for a shop with mandrel bending capability. I was uninformed and got bit.

Also, I recommend the Husker Performance stainless X-pipe over the magnaflow, I've had both and the husker is a much more substantial product. The MF is essentially stamped sheet metal. Husker is cheaper, too, about $45.00 shipped, vs the $85.00 retail for MF.

[Cajun]

Even tubing that is not mandrel bend will give a better flow than the factory piping pictured below. When Nissan smashes two pieces of 2.25 piping to fit into one 3 inch pipe, the flow is substantially reduced. When replacing this cluser with anyones X-Pipe, the flow is increased. I agree, mandrel bending is the absoloute best method, but, as you said, 99% of the shops cannot mandrel bend the piping. Titanwild, give these guys a source for that Husker X-Pipe, wish I had known about it before I bought the MF.
DT

[LikeaRock14]

Cajun is right. All our engine builders, from karts to Sprint Cars, they all say the best thing you can let your engine do is BREATH!
Of course, with an exhaust on a typical street truck, you don't want to open it up too much, for certain reasons of course.

Oh yeah, I like the tips!!!

[bestatchess]

Originally Posted by Cajun

Attached are pics of the Stock Y pipe. The restriction is sickening. I copied a system shown here on a different thread. Cut both pipes after the cats, welded 2.25 tubing to the X-Pipe, the 2.25 tubing to a Flowmaster 70 series 2.25 dual in and 2.25 dual out. Quite an improvement...PerformancePeddler.com sold the X-Pipe for less than $70.00 delivered, the Flowmaster for $122.00 delivered, the exhaust guy charged me $120.00..I used the dual Stainless tips from my HarleyDavidson F150,,,,finished out very neat..
DT

How does this new exhaust compare with the stock respecting noise level in the cab?

[Cajun]

In certain applications, backpressure is desirable, look at the fastest drag cars,,,,,open headers???? When we go to the track----open headers.. I have driven the truck about 100 miles, mostly city driving. My wife claims it is no louder than stock, I agree. The sound is different, but, not much louder, if any. It has that Flowmaster rumble sound. I have driven the truck up to 100 mph, on a test track, of course,,,,no drone, no louder than stock at highway speeds. The responsiveness is much better, throttle is touchier now, that I like. Really funny,,,,, the tail pipes and tips are from my 02 HarleyDavidson F150,,,,it fit perfectly, over the axle-perfect??????go figure???
DT

[dersheist]

Playing devil's advocate...although I am not an engineer as some members of this forum are, but could the difference in size be from the difference in length of the pipe to join with the Y-pipe? The driver side pipe has a longer distance to travel than the passenger side pipe to lead into the Y-pipe. Maybe the difference in size is to even out backpressure, similar to how a short thin wire is similar in resistance to a thick long wire; if built correctly.

Just a thought.

[Cajun]

Dersheist, I understand your analogy..The stock muffler on our trucks provide enough back pressure without the Y. My thoughts and opinion only........It is much cheaper to smash the ends of 2 peices of 2.25" pipes and shove them into a 3" exhaust pipe than to have a Y pipe or X pipe built and properly installed. We are thinking on a small plane, we see a couple hundred trucks, Nissan budgeting see a couple hundred thousand trucks. A properly built and installed Y pipe would cost at least $100.00 per truck. A wild guess at the 2004 production???????25,000 trucks. I know that is a low number,,,,but, 25,000 at $100.00 each that's $2.5 MILLIOIN dollars. And that would be $2.5 million PROFIT....Now we begin to understand the logic of cheaper parts??? The factory Y-Pipe has nothing to do with proper backpressure, it has to do with economics.
DT

[titanwild]

Originally Posted by Cajun

Titanwild, give these guys a source for that Husker X-Pipe, wish I had known about it before I bought the MF.
DT

Here's the link, their service is super! [SIZE=4][FONT=Arial]http://www.exhaustproslinc.com/[/FONT][/SIZE]

This is the same x-pipe that Sammy Sandbag used in his original Flowmaster x-pipe system. His thread (Flowmaster Dual Pipes) has tons of good info and pics. Link is: [SIZE=4]http://www.titantalk.com/forums/showthread.php?t=10583&page=1&pp=15[/SIZE]

[Cajun]

Thanks titanwild, this place is a great source of info. That's what makes it a nice community.
DT