LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

Just bought headers...should I run a Y pipe exhaust or duals?

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Old Jan 7, 2008 | 03:51 PM
  #16  
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you mean "LOPE" lol. and yeah, only cause it seperates the two side exh. so it'll "putt-putt-putt" from both sides. its wierd it almost makes it sound like two seperate engines. you can get quiet mufflers, and there are probably some that you wont lose power compared to the race bullits, but then your back to "does it have any power benefits over a ypipe" question if you have dual mufflers/pipes and quite mufflers on them. I had some generic "turbo" mufflers on myiroc at first, but they were too quiet. fine at idle sounded kinda cool still, but at WOT it just didnt sound right. but VERY stealth. I swapped them for a pair of bullit's thinking they would release some power. but who knows. it sounded more powerful.?!?.
Old Jan 7, 2008 | 03:53 PM
  #17  
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Originally Posted by JakeRobb
Y-pipe vs H-pipe vs X-pipe vs separate pipes will affect what it sounds like, but assuming that you're not flow-limited, only mufflers (and cutouts) will affect how loud it is.

Corsa (my personal favorite; forgive me) is quiet at idle and cruise, pleasantly aggressive when accelerating, and only a little loud at WOT. Magnaflow is similar, but a little louder at all times and with a different character. If "clean" sound is your priority, what in the heck are you doing with Flowmasters?
LMAO...Flowmasters were on the car when I bought it. It is the Y pipe to a single muffler. This is why I'm asking...When I put my headers on I will have the option to run the duals or keep the Flowmaster. If I run duals I will put a different muffler on it ...
Old Jan 7, 2008 | 03:58 PM
  #18  
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I think that a set of longtubes, a 3" y-pipe, and a 3" Magnaflow catback will be exactly what you're looking for.
Old Jan 7, 2008 | 04:38 PM
  #19  
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Originally Posted by JakeRobb
I think that a set of longtubes, a 3" y-pipe, and a 3" Magnaflow catback will be exactly what you're looking for.
yeah i have to agree with this, exactly what i have. its not to loud until you want it to be
Old Jan 7, 2008 | 04:44 PM
  #20  
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Originally Posted by JakeRobb
I think that a set of longtubes, a 3" y-pipe, and a 3" Magnaflow catback will be exactly what you're looking for.
Originally Posted by dangalla
yeah i have to agree with this, exactly what i have. its not to loud until you want it to be
Nice Very Nice. I'll definitately consider...thanks guys
Old Jan 7, 2008 | 06:06 PM
  #21  
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Originally Posted by JakeRobb
The Flowmaster catback for F-bodies makes less horsepower than the stock exhaust. Ditch it for a Magnaflow -- that'll get you 20hp, maybe more.
does the flowmaster really restrict flow that bad? I've seen pictures of the magnaflow system and it looks like it definatly flows better, is the 20hp realistic or is it more like maybe 10 over the flowmaster?
Old Jan 7, 2008 | 06:35 PM
  #22  
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Is this a duals vs. Y-pipe thread, or a best catback thread? Duals would be best, but you better find some wizards to put it together. About 80% of the true dual set-ups i see on this board are pretty rough looking, with virtually no ground clearance to speak of (there are some good ones, but not many). The best cat-back as far as flow is concerned has got to be the SLP 2OTL... straight in, straight out... No "T" in the muffler to slow down exhaust. (I think there is another brand that uses this approach too, but i forget which). Another good idea is putting an e-cutout after the Y-pipe. That way you could keep your Flowbastard, and still be able to have a free flowing exhaust when you want to.
Old Jan 7, 2008 | 06:45 PM
  #23  
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Originally Posted by wildweasel
Is this a duals vs. Y-pipe thread.
read it, its pretty obvious
Originally Posted by wildweasel
Duals would be best, but you better find some wizards to put it together. About 80% of the true dual set-ups i see on this board are pretty rough looking, with virtually no ground clearance to speak of.
really its the long tubes with y pipe that causes that
Originally Posted by wildweasel
The best cat-back as far as flow is concerned has got to be the SLP 2OTL... straight in, straight out... No "T" in the muffler to slow down exhaust..
other than the fact that it is ridiculously loud and we have already discussed volume, and please show me one muffler with a T in it, i never seen one before
Originally Posted by wildweasel
Another good idea is putting an e-cutout after the Y-pipe..
again we already discussed that

sorry to pick apart your post like that but everything you said was already stated and i hate when people post without reading what has already been covered
Old Jan 7, 2008 | 07:24 PM
  #24  
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Originally Posted by dangalla
read it, its pretty obvious

really its the long tubes with y pipe that causes that

other than the fact that it is ridiculously loud and we have already discussed volume, and please show me one muffler with a T in it, i never seen one before

again we already discussed that

sorry to pick apart your post like that but everything you said was already stated and i hate when people post without reading what has already been covered
#1 Yes, it is obvious... that was my point.
#2 True, but most people dump their duals pre-axle, using mufflers under the floor-pan, which cuts down on clearance a lot, even more than a Y-pipe.
#3 I have the 2OTL, and I don't think it's that loud; besides, I was only speaking in terms of flow, if you read closely... as far as the T goes... if you've got a muffler with one pipe entering in the passenger side, and an exiting pipe on BOTH sides, then somewhere inside there has GOT to be a T or a Y or some other kind of split that diverts flow. I thought that would be pretty obvious.
#4 oops I guess I missed the part about the cutout. Good thing you had plenty of time on your hands to gripe about it.
Old Jan 7, 2008 | 10:02 PM
  #25  
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Originally Posted by wildweasel
The best cat-back as far as flow is concerned has got to be the SLP 2OTL... straight in, straight out...
There is very little disruption in exhaust flow at a mandrel bend in a pipe. The flow is all in pipe diameter and muffler design.

Borla's adjustable system allows you to channel all of the exhaust right past the muffler and straight out. As far as catbacks kits go, that one wins.

Corsa, Magnaflow, DynoMax, and possibly other mufflers are straight-through designs. You can look in one end of the muffler and see straight out the other end. Nothing in the way to disrupt flow.

If I had the money to spare, I'd buy one of each catback and do a bunch of back-to-back dyno runs. You'd then see that, while SLP is good, and certainly better than stock, Corsa and the others I mentioned are even better.

Old Jan 7, 2008 | 11:51 PM
  #26  
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flowmaster isnt costing you 20 hp more like 8 or 9 but still. Your gas mpg will go up too if you switch, or mine did at least. I got a hooker areochamber and couldnt be happier.
As like everyone else said the duals will really help out if your plan on heads and cam or n2o. Or if you just want to be cool. Good luck
Old Jan 8, 2008 | 01:07 AM
  #27  
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If emissions laws apply to you then true duals will not pass.
Old Jan 8, 2008 | 06:40 AM
  #28  
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Like everyone else stated you definetely need to dump the crapmaster. and the pacesetter y and Magnaflow cat-back won't break the bank as well, and you could squeeze out a few more ponies with hi-flo cats. If you have plenty of cash invest it in the Borla or Corsa though for sure bud.

With all this being said, why is this in Engine tech? Last time I recalled there was a whole section for exhaustacular crap.
Old Jan 8, 2008 | 07:23 AM
  #29  
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Originally Posted by slomarao
flowmaster isnt costing you 20 hp more like 8 or 9 but still. Your gas mpg will go up too if you switch, or mine did at least. I got a hooker areochamber and couldnt be happier.
As like everyone else said the duals will really help out if your plan on heads and cam or n2o. Or if you just want to be cool. Good luck
Flowmaster is costing him about 5rwhp relative to the stock catback. A Magnaflow (or any of the others I've recommended) will add 10-15rwhp relative to the stock catback. That means he could gain 15-20rwhp by switching.

Adding the longtubes and a 3" Y-pipe is going to be worth another 20, with the added bonus of some extra torque at low RPMs.
Old Jan 8, 2008 | 07:43 AM
  #30  
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Originally Posted by JakeRobb
Flowmaster is costing him about 5rwhp relative to the stock catback. A Magnaflow (or any of the others I've recommended) will add 10-15rwhp relative to the stock catback. That means he could gain 15-20rwhp by switching.

Adding the longtubes and a 3" Y-pipe is going to be worth another 20, with the added bonus of some extra torque at low RPMs.
This is all good news... I think that I will get rid of the FlowMaster for sure. If it is costing me power then, I don't want it...lol Magnaflow is sounding pretty nice right about now.

Last edited by yungin' w/a z28; Jan 8, 2008 at 10:31 AM.



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