The "Y Pipe" - a flawed design?
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Very, Very true. Alot of folks think in that "big is better" mentality with exhaust. A smart, well thought out and built single system will help provide much more torque than that found with TD's.
Very, Very true. Alot of folks think in that "big is better" mentality with exhaust. A smart, well thought out and built single system will help provide much more torque than that found with TD's.
I here all of you guys, but what about making +500hp (my goal) through a SINGLE 2.75" pipe?
Seems to me that the y pipe will be my weak link and hurt hp... I mean, why in the hell do I need to spend nearly $2k on a Mamo ported FAST intake if I'm cramed at the y pipe??
Get my point?
Seems to me that the y pipe will be my weak link and hurt hp... I mean, why in the hell do I need to spend nearly $2k on a Mamo ported FAST intake if I'm cramed at the y pipe??
Get my point?
I think that Patrick G proved that a well designed ypipe actually works better than a true dual setup. You can read his posts yourself, but I think he tried both setups and actually made more poer with his current ypipe setup. Another myth he dispelled is that you need big heads and cams to make power. He actually made more usable power with AFR 205s than 225s. He made the same hp, but actually more torque peak with the 205s over the 225s.
Bigger isn't always better folks. Gotta realize that a x-merge has two flow disturbances, where the exhaust merges, then splits, where a ypipe only has the merge as a flow disturbance. So it really comes down to the merge that makes all the difference. The smoother the transistion the better the flow and power. Plus there isn't much to gain with a 3"-4" difference once you get past the merge collector on the ypipe. A 3" pipe will flow a butt ton.
Bigger isn't always better folks. Gotta realize that a x-merge has two flow disturbances, where the exhaust merges, then splits, where a ypipe only has the merge as a flow disturbance. So it really comes down to the merge that makes all the difference. The smoother the transistion the better the flow and power. Plus there isn't much to gain with a 3"-4" difference once you get past the merge collector on the ypipe. A 3" pipe will flow a butt ton.
I've read most of Patrick's posts... he's a smart guy...
I actually plan to use the AFR 205s to reach my goal...
Wasn't Patrick's y pipe merge 4"? What catback is he using again?
Here is my thought:
1. Call ARH and have them fabricate a dual 3" y pipe w/ 4" merge.
2. Call Mufflex and order their 4" catback.
Problem solved.
BUT, I really do like the looks of the Corsa... too bad their pipe is only 2.75", correct?
I actually plan to use the AFR 205s to reach my goal...
Wasn't Patrick's y pipe merge 4"? What catback is he using again?
Here is my thought:
1. Call ARH and have them fabricate a dual 3" y pipe w/ 4" merge.
2. Call Mufflex and order their 4" catback.
Problem solved.
BUT, I really do like the looks of the Corsa... too bad their pipe is only 2.75", correct?
TECH Veteran
Joined: Aug 2002
Posts: 4,055
Likes: 1
From: Hartsdale, NY
I believe there are many guys making 500hp with a Y-pipe and aftermarket muffler.
I thought some back-pressure is desirable to build low-end torque? Anyway, a 2.75 inch Y-pipe can flow a TON of exhaust gas.
I thought some back-pressure is desirable to build low-end torque? Anyway, a 2.75 inch Y-pipe can flow a TON of exhaust gas.
I have no doubt you can force 10 lbs of **** in a 5 lb bag... we do it all the time in construction...
My point is this - what LOSS is there with a merge to a SINGLE 2.75" pipe and +500hp??
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I've read most of Patrick's posts... he's a smart guy...
I actually plan to use the AFR 205s to reach my goal...
Wasn't Patrick's y pipe merge 4"? What catback is he using again?
Here is my thought:
1. Call ARH and have them fabricate a dual 3" y pipe w/ 4" merge.
2. Call Mufflex and order their 4" catback.
Problem solved.
BUT, I really do like the looks of the Corsa... too bad their pipe is only 2.75", correct?
I actually plan to use the AFR 205s to reach my goal...
Wasn't Patrick's y pipe merge 4"? What catback is he using again?
Here is my thought:
1. Call ARH and have them fabricate a dual 3" y pipe w/ 4" merge.
2. Call Mufflex and order their 4" catback.
Problem solved.
BUT, I really do like the looks of the Corsa... too bad their pipe is only 2.75", correct?
https://ls1tech.com/forums/showthrea...082&highlight=
I don't think you'll need a 4" pipe to make 500HP. I have a custom Mufflex exhaust; 3" y-pipe to a 3.5" catback. It bangs every once in awhile on the upper panhard bar. Other than the fitment is awesome. What I am trying to say is you can probably save some weight and room with a 3.5".
https://ls1tech.com/forums/showthrea...082&highlight=
https://ls1tech.com/forums/showthrea...082&highlight=
Great info! I like your system man...
Yeah, I'm not stuck on 4" as I'm sure 3.5" is more the size that will be required...
Thanks for the info
No problem. After reading more and more exhaust sytem info I am extremly happy with my system. The sound is awesome and it hasn't held me back from making the numbers I wanted. I have no doubt that it will not hold me back from future modifications. There's so many options, if you can find a shop you trust the sky is the limit.
You don't need a 4" system if you're only in the 500-600 hp range. You could get the Mufflex y-pipe which has the 4" merge collector and then go with the 3.5" cat-back. But I would recommend cutting the short 2.75" section off the y-pipe and go with full 3" from the y-pipe back. That's what I did. I never understood why GM had it neck down to 2.75 and then open back up. My car is actually pretty quiet at idle and low rpm's with the stainless longtubes, dual 3" cats and the Jardine cat-back. You have to remember that louder is not better and bigger is not always better when it comes to exhaust.
I've got a 2.5" y-pipe that merges to a 3.5" merge, i-pipe and muffler with 3.5 inch pipes on the tips. Works well. No banging. The 2.5" y-pipe allows me to be lowered without losing clearance.
Last edited by Viper; Jan 6, 2008 at 02:13 PM.
all aftermarket cat-backs are 3"+ Corsa included. Im telling you, 3" piping all the way back through a Corsa exhaust with a flowmaster dual 3" in 1 3" out and you will flow some big numbers without sacraficing anything
Not necessarily true. Most cat-backs neck down to 2.75" where it connects to the stock y-pipe. That's the part I'm saying to cut off both the y-pipe and cat-back and put in a true 3" piece.
4in is over kill just have a muffler shop make you a custom exhaust set up........and you complain that u dont want ur car 2 be 2 loud and u still want true duals? wtf
heres my set up very similar to pat g's
^^qtp lt headers 1 3/4 primarys with 3 in collector
^^custom y pipe with flowmaster y-collector ,3in intake with 4in out let merging back into 3in i-pipe
^^dmh 3 in electric cut out, after ypipe
^^going into an slp dual dual catback
flows great.....super quiet with the cut out closed going through the dd....and sounds like a demon with a push of a button with the cut out open......and supports over 500rwhp , best of both worlds
heres my set up very similar to pat g's
^^qtp lt headers 1 3/4 primarys with 3 in collector
^^custom y pipe with flowmaster y-collector ,3in intake with 4in out let merging back into 3in i-pipe
^^dmh 3 in electric cut out, after ypipe
^^going into an slp dual dual catback
flows great.....super quiet with the cut out closed going through the dd....and sounds like a demon with a push of a button with the cut out open......and supports over 500rwhp , best of both worlds
2 things that true duals with an X or H crossover give you that a Y setup will not are: more power and torque "under the curve" and a deeper, less raspy (or no rasp) sound. To me, the issue of true duals vs a good Y setup is like shorty headers vs long tubes. Shortys do make a little more power than manifolds, but they give up some at the peak and even more low end and midrange. If this were not the case with true duals vs a single Y, every muscle car made today would have single exhaust.
It's really a pretty simple concept that boils down to what you want out of an exhaust setup and what you're willing to do to get there.
Jason
It's really a pretty simple concept that boils down to what you want out of an exhaust setup and what you're willing to do to get there.
Jason
