z28:headers and stock catback
Thread Starter
12 Second Club
iTrader: (33)
Joined: Jan 2005
Posts: 2,584
Likes: 0
From: winter springs, fl
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
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
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.
Thread Starter
12 Second Club
iTrader: (33)
Joined: Jan 2005
Posts: 2,584
Likes: 0
From: winter springs, fl
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.
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.
Trending Topics
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.
-Post #100-
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo
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.
Originally Posted by Justin00SS
Oh and LTs make a good 25-30% more power then mids. Read the exhaust faqs.
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.
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.
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).
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.