z28:headers and stock catback
11-25-2006, 11:50 PM
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z28:headers and stock catback quick question beforei hit the bed, i got some mac mids at a great price. now i still have the stock catback, which as most of you know is 2.5". the y pipe to the macs is 3" now is this ok to put together or do i need an aftermarket catback. ill eventually get a catback in a month or so but is it fne to run for the moment? thanks
11-26-2006, 12:10 AM
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Originally Posted by Hennytime
quick question beforei hit the bed, i got some mac mids at a great price. now i still have the stock catback, which as most of you know is 2.5". the y pipe to the macs is 3" now is this ok to put together or do i need an aftermarket catback. ill eventually get a catback in a month or so but is it fne to run for the moment? thanks
11-26-2006, 12:30 AM
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I ran a LT/Y-pipe/stock catback on the '02 for about 5 months.
I went to a muffler shop and had them cut 8" of pipe, I forget the OD/ID, but it was intermediate between the Y-pipe merge's ID and the stock catback's OD.
I brought my merge from my Y-pipe with me when I went.
The shop expanded one side slightly for me (that side went into the merge) and I cut a two slits opposite each other on the other end of that pipe so once the U-bolt was tightened over that end of the pipe (which was slid over the catback's I-pipe) it would collapse enough to become tight around the stock catback.
I was leak free until the cats in my QTP Y-pipe blew and clogged the catback then I purchased an aftermarket catback.
If I remember, and if you want, I can get pics tommorow to explain what the hell I'm talking about.
I went to a muffler shop and had them cut 8" of pipe, I forget the OD/ID, but it was intermediate between the Y-pipe merge's ID and the stock catback's OD.
I brought my merge from my Y-pipe with me when I went.
The shop expanded one side slightly for me (that side went into the merge) and I cut a two slits opposite each other on the other end of that pipe so once the U-bolt was tightened over that end of the pipe (which was slid over the catback's I-pipe) it would collapse enough to become tight around the stock catback.
I was leak free until the cats in my QTP Y-pipe blew and clogged the catback then I purchased an aftermarket catback.
If I remember, and if you want, I can get pics tommorow to explain what the hell I'm talking about.
11-26-2006, 08:27 AM
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Originally Posted by Snuffles
I ran a LT/Y-pipe/stock catback on the '02 for about 5 months.
I went to a muffler shop and had them cut 8" of pipe, I forget the OD/ID, but it was intermediate between the Y-pipe merge's ID and the stock catback's OD.
I brought my merge from my Y-pipe with me when I went.
The shop expanded one side slightly for me (that side went into the merge) and I cut a two slits opposite each other on the other end of that pipe so once the U-bolt was tightened over that end of the pipe (which was slid over the catback's I-pipe) it would collapse enough to become tight around the stock catback.
I was leak free until the cats in my QTP Y-pipe blew and clogged the catback then I purchased an aftermarket catback.
If I remember, and if you want, I can get pics tommorow to explain what the hell I'm talking about.
I went to a muffler shop and had them cut 8" of pipe, I forget the OD/ID, but it was intermediate between the Y-pipe merge's ID and the stock catback's OD.
I brought my merge from my Y-pipe with me when I went.
The shop expanded one side slightly for me (that side went into the merge) and I cut a two slits opposite each other on the other end of that pipe so once the U-bolt was tightened over that end of the pipe (which was slid over the catback's I-pipe) it would collapse enough to become tight around the stock catback.
I was leak free until the cats in my QTP Y-pipe blew and clogged the catback then I purchased an aftermarket catback.
If I remember, and if you want, I can get pics tommorow to explain what the hell I'm talking about.
11-26-2006, 07:28 PM
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Originally Posted by Cop Car
mids are a complete waste of time
Hennytime:
I looked for the pipe I had made but my stock I-pipe was thrown out with leaf cleanup two weeks ago.
Would have been nice to have it for pics but it would have been nicer because I could have just mailed the collar to you, to save the trouble and time.
Anyway, here's a crude drawing in MSPaint.
The dashed part is where I had the shop put it on an expander to an OD of 3".
Any competent exhaust shop can expand a pipe.
You'll see the slits on the other end of the pipe, so the pipe is able to get a hold of the I-pipe.
The black arrows are where you would want to put U-clamps.
11-26-2006, 11:55 PM
#7
Snuffles, I just got a flowmaster y-merge with 3" in and 3.5" out. How'd yours work out for you? I'm also intending on connecting this back to my SLP D/D - think it will work well?
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11-27-2006, 12:14 AM
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Originally Posted by SmokeySS
Snuffles, I just got a flowmaster y-merge with 3" in and 3.5" out. How'd yours work out for you? I'm also intending on connecting this back to my SLP D/D - think it will work well?
It will work fine. Get a 3.5" to 3.0" reducer cone to put between your merge and the Dual/Dual and you'll be set.
I know you can get them directly from Flowmaster but many of our sponsors sell them too. >>>>>
My Y-pipe already cam with a reducer so once I picked up my aftermarket CB it slid right in.
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11-27-2006, 11:56 AM
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I ran the lts/ory/stock catback setup for probably 6 months. I had a cutout that I left open most of the time though. When I closed it, the car was very quiet. Not as quiet as stock, but quiet. There was a kind of "tinny" sound that you could hear from inside the car under accelleration.
That being said, yeah, you'll need to take it to a shop to have them hook up the y-pipe to the stock i-pipe. I tried to do it myself unsuccessfully.
That being said, yeah, you'll need to take it to a shop to have them hook up the y-pipe to the stock i-pipe. I tried to do it myself unsuccessfully.
11-27-2006, 12:10 PM
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im puting down 385+ to the rewheels with mac mids and my cam though an stalled auto with 4.10s.. its all a matter of scavaging for that few extra hp pts
11-27-2006, 12:20 PM
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Originally Posted by Justin00SS
Oh and LTs make a good 25-30% more power then mids. Read the exhaust faqs.
11-27-2006, 12:22 PM
#16
Originally Posted by lsx24
I wouldn't call 5 hp 25-30%...although midrange tq increase/decrease maybe that much. All depends on where you start and where you're looking to end up.
If you gain 10-15hp from the mids and 20-25hp from the LTs then that is a very big difference. Not to mention the performance difference will increase with the addition of a cam/heads/intake.
11-27-2006, 12:27 PM
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Originally Posted by Justin00SS
If you gain 10-15hp from the mids and 20-25hp from the LTs then that is a very big difference.
11-27-2006, 12:29 PM
#18
Originally Posted by lsx24
That's not the case however....MACs are only down 5-6 hp over LTs (and that's with a Cam and Heads...), not the 10 you quote above...which is double the actual value (of 5-6).
11-27-2006, 12:54 PM
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Originally Posted by Justin00SS
Do you have mids? There is a reason why they sell so cheap.
11-27-2006, 12:58 PM
#20
Originally Posted by lsx24
They are still a great budget alternative to Pacesetters at less than half the cost.
If your gonna be in there doing exhaust then do it the right way.