Just ordered Corsa Indy's and Z06 airbox top and K&N filter element. It's been evident from my perusing this tech section that the airfilter will give me added HP but the exhaust is for smile power, if I want the exhaust to add HP I need an X pipe. My question is twofold: 1) Would it be the same if I had the the muffler shop weld in a pipe between the pipes running aft to equalize the pressure or does having the tupes in line with each other have some sort of scavenging effect. 2) Which X pipe? I will not be racing but I do enjoy my car.

Ronnysho

PS The best G's are sideways. Just my $.03 worth :confused: :flag

 

Ronnysho:

The X-pipe doesn't really add much horsepower. It primarily equalizes the flow (pulses), and the stock systems already come with an "H" pipe, with different inside diameters depending on the year. The X-pipe is welded in place of the stock H-pipe, and has an interior diameter similar to the actual exhaust pipe -- it's sometimes called a crossover pipe also. If you have a muffler shop make one up for you, make it more of an X than an H -- the side to side flow is obviously smoother with an X shape. But it would probably be about the same price to just buy one and have them install it only.

What it does do is cut back on the "snap, crackle, and pop" on the overrun, and reduces what some people call the "motor boat" idle which is more noticeable without the pipe.

Don't do it for the horsepower, do it for the sound.

 

Thank you EHS

 

Ronnysho

No problem.

I forgot to mention that you may want to try a new exhaust without the X pipe first. You can always install it later, but you may actually like a more "lumpy" idle sound (like a Harley), and more burbling on the overrun. It's also cheaper. :D

Take care.

 

Thank you sir. Ron

 

The "H" pipe is not the same diameter of the exhaust pipe internally, only on the outside. It is much smaller. The X pipe will truly scavange the flow. It truly affects the sound and I am sure even out the flow of the exhaust far more than the H pie. When you cut out the H pipe and replace it, cut it in half and look at the interior of it to compare the ID's of ther two.

 

After pulling all 4 cats and installing the TPIS LT's,x-pipe,and Corsa Indy's I believe the x-pipe has actually softened the sound. Yes, it does reduce the snap,crcle ,pop but it will add some torque and h.p. if it's placed close up to the engine rather than to the rear of the exhaust system.IMO.(See my homepage for TPIS installation pics with offroad x-pipe and NO cats.A great sound and NO resonance! :yesnod:

 

Question on the install. What do you do about the two hanger brackets just aft of the factory H pipe? Do you cut those off and weld to the X pipe or leave them and put the X pipe forward of them closer to the engine?
I've put on B & B PRTs and want to put in an Exit 28 X pipe to smooth it out a bit. thanks

 

Here is some info on my X-Pipe install
http://home.att.net/~jansseng/x-Pipe.htm

 

So what did you do with the hanging brackets? I can't tell from your pics. thanks.

 

Never mind, I just got under and took a look. The X pipe will fit forward of the hanging brackets. thanks

 

Silly question perhaps but here goes. If you cut out the cats do you: 1) Violate emissions laws 2) Void warranty

:confused:

 

Ronnysho:

The X-pipe is the "cross-over" pipe. You can weld it in further forward, and have two cross-over pipes, but like the Bassani X-Pipe install instructions above, most people locate the X-pipe where the H-pipe was. More than one crossover is redundant, and as I pointed out in my first post above, the H-pipe has a smaller inside diameter and is pretty much useless (depending on your ID). All my two-cylinder Italian motorcycles had only one crossover in the exhaust -- worked pretty well.

Most people see 3 to 5 to maybe 7 extra horsepower from the X-pipe on your setup (intake and Corsa's), closer to 5 hp tops. That's about 1-2% and statistically insignificant -- a winter day will give you more performance, so will driving with half a tank of gas. Vstella has a lot of work on his motor, long tube headers, no cats, etc. -- his results will vary. I didn't get the impression from you that you were prepared to do that much to your car just yet. Remember, the cats are the most restrictive part of the exhaust, and the X-pipe is located after the restriction, so the power is already lost. Once you turn down the tap, it's hard to get the water flow back further down in the pipes.

And, yes, when you cut off the cats, you are violating emissions laws in all fifty states and voiding your OEM warranty (which is longer on the emissions portion of the car, BTW). If your car has the smaller pre-cats, you may also get trouble codes on the O2 sensors, if you take those out. Some folks use O2 simulators so the car still "thinks" it has cats. And, the installer who does the work for you may get uncomfortable with all of this (the Feds tend to go after the shop, not the customer), although the X-pipe after the cats is not a problem since it does'nt affect the emissions.

Hope this helps. :smash:

 

EHS, Thank you for taking an interest in my question, it sure is amazing the wealth of knowlege that is available on this forum. I am just trying to make an enjoyable free breathing machine thats sound nice and feels even better. I do not want to MOD my engine out of warranty although I sure understand the desire to make as much power as these LS1/LS6 engines can muster. Wish I had the sheckels to have another non streeted C5 to play with, (SIGH) maybe someday! I've known some twin cylinder Italian Women and one crossover pipe was DEFINITELY NOT enough :) Again, thank you sir for your time and obviously knowledgable answer. Ron

PS. I believe the BEST G's are sideways in these wonderful cars

 

Vstella, Also, thank you for your time, looks like you have an AWESOME ride and I'd love to see it if I'm ever down that way. Ron

PS Pewter is the best color


[Modified by Ronnysho, 8:14 PM 11/20/2001]

 

Ronnysho,

Install the Magnaflow x-pipe and I guarantee that you will feel the torque!!

It is on special at: $199.95 SHIPPED!

BEST designed x-pipe on the market!

You will not be disappointed!!
http://www.stores.yahoo.com/corvette...agc5xppip.html

Thanks!

Shawn


[Modified by L.A.P.D., 1:03 PM 11/20/2001]

 

Ronnysho,

I just thought of two additional pieces of information to check out, under the CorvetteForum reviews section. Here are the two links:
http://www.corvetteforum.cc/reviews/...196&TopicID=15

This is the Corsa brand X-pipe, and it achieves, according to the review: "Horsepower increase?...Maybe 3-4 h.p."


Also see:
http://www.corvetteforum.cc/reviews/...180&TopicID=15

For the ProFlow X-pipe, which has an increase, according to porduct literature, of "6-8 Hp and 8-10 Tq."


I don't know what the Magnaflow Exhaust claims are for their pipe, but perhaps Shawn at LAPD can provide that information.

 

In your stock exhaust there IS an H pipe installed from the factory!!!!

 

Thank you for the kind words. Rocknron

 

I've looked at alotta x-pipes and I wonder why you can't make your own? :cheers: