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Camaro V8 LS3 / L99 Engine, Exhaust, and Bolt-Ons Bolt-Ons | Intakes | Exhaust

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Old 06-11-2013, 02:59 PM   #1
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Dynatech headers

So i just jumped on a deal for used dynatech long tubes with the 3in catted connection pipe. However my exhaust is 2.5in (solo mach XL).

what would be my cheapest option to connect it to the exhaust?

Do you think anyone has catless that wants cats?

opinions appreciated.
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Old 06-11-2013, 04:03 PM   #2
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Maybe call Dynatech and see if they have a 3" x 2.5" adapter? Other than that, a decent muffler shop might be able to make an adapter for you.
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Old 06-11-2013, 04:15 PM   #3
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Maybe call Dynatech and see if they have a 3" x 2.5" adapter? Other than that, a decent muffler shop might be able to make an adapter for you.
Yeah im going to call them after I get off work. I know I could probably buy the 2.5in connection new. Just don't know how much that will be.
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Old 06-11-2013, 04:18 PM   #4
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You need the cat with 2 1/2" outlet.
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Old 06-11-2013, 04:19 PM   #5
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Originally Posted by Inferno LS3 View Post
You need the cat with 2 1/2" outlet.
no other way around it?
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Old 06-11-2013, 04:31 PM   #6
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I'm sure a muffler shop can handle it. It might look a little hacked but it will work.
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Old 06-11-2013, 04:32 PM   #7
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Whatever you do DO NOT weld the system in please. Just my.2
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Old 06-11-2013, 04:35 PM   #8
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I'm sure a muffler shop can handle it. It might look a little hacked but it will work.
My concern is I don't want to pay someone to install the headers and I think the 3in to 2.5in adapter would have to be welded onto the catback as I don't think there is enough room on the Connection pipe to cut and weld the adapter in. So do I have to take off my catback and bring it in for them to do it?

install the headers without the connection pipe and somehow hold the exhaust up and drive it to the muffler shop and let them do what they need to do to connect it then?

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Old 06-11-2013, 04:51 PM   #9
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Is your connection from the headers to the exhaust a cat or offroad pipe? Do u want cats? A muffler shop can mod your exhaust to fit what ever you have after your headers.
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Old 06-11-2013, 04:56 PM   #10
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Whatever you do DO NOT weld the system in please. Just my.2
Oh no I wouldn't weld the whole thing just the reducer and then use a clamp.

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Is your connection from the headers to the exhaust a cat or offroad pipe? Do u want cats? A muffler shop can mod your exhaust to fit what ever you have after your headers.
It is a catted system. I wasn't going to go with catted but couldn't pass the deal up. I don't know of any muffler shops that will make me a catless connection pipe.
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Old 06-11-2013, 04:58 PM   #11
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Maybe you jumped a bit too quick..? Driving open headers to the muffler shop should be quite the ride. Litle88 is right...DO NOT weld on your pipes.

Do you want to run cats or not? If not and you don't want to drive to the muffler shop with open headers, you could measure the length of pipe you need and have the shop fab it for you. If yes, the easiest is to do what Inferno said.
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Old 06-11-2013, 05:06 PM   #12
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Yeah I might have jumped too quick but even if I have to put a $100 or so into making it fit I still think its a good deal. I'm going to look into the price of just buying the 2.5in connector.

Cats or not does not matter to me.
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Old 06-11-2013, 05:08 PM   #13
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I hear 'ya. Have you ridden in a car without cats? Not so much a volume issue as a smell....some like it, some don't, some don't know.....
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Old 06-11-2013, 05:14 PM   #14
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I drove mine open headers with the exhaust boxed up in my backseat! Im in North Dallas and I passed 2 cops on the way there and my heart was beating 100miles an hr. I threw the car in neutral and coasted as I went by them! Luckily no ticket! These 2 guys in a work truck pulled up beside me when I was driving it real slow and you would think they were 2 kids seeing Superman! They were cheesing and giving me both thumbs up, wanting me to hit the throttle!!
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Old 06-11-2013, 05:18 PM   #15
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^^^^^....that is funny.....high pucker factor for sure.
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Old 06-11-2013, 05:19 PM   #16
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I hear 'ya. Have you ridden in a car without cats? Not so much a volume issue as a smell....some like it, some don't, some don't know.....
Yeah my last car was a G8 GT with DT tri y's catless. Only time I smelled anything even remotely was if I was sitting in traffic with the windows down and had a tail wind.

I was thinking that there would have to be some cutting but I did some searching and I found a 3in (outside Diameter) to 2.75in (Inside diameter) adapter.

If what I'm thinking is right the 3in outside diameter should fit inside the catted connection pipe (3in) and the 2.75in inside diameter should fit over the 2.5in exhaust and I can just clamp them together?
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Old 06-11-2013, 05:20 PM   #17
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Originally Posted by Camarojt View Post
I drove mine open headers with the exhaust boxed up in my backseat! Im in North Dallas and I passed 2 cops on the way there and my heart was beating 100miles an hr. I threw the car in neutral and coasted as I went by them! Luckily no ticket! These 2 guys in a work truck pulled up beside me when I was driving it real slow and you would think they were 2 kids seeing Superman! They were cheesing and giving me both thumbs up, wanting me to hit the throttle!!
Open headers... straight pipe... same thing right? Solo Mach XL is just straight pipes with J pipes. is it not?

I can't wait for the looks!
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Old 06-11-2013, 05:27 PM   #18
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Originally Posted by steveo9043 View Post
Yeah my last car was a G8 GT with DT tri y's catless. Only time I smelled anything even remotely was if I was sitting in traffic with the windows down and had a tail wind.

I was thinking that there would have to be some cutting but I did some searching and I found a 3in (outside Diameter) to 2.75in (Inside diameter) adapter.

If what I'm thinking is right the 3in outside diameter should fit inside the catted connection pipe (3in) and the 2.75in inside diameter should fit over the 2.5in exhaust and I can just clamp them together?
I'm not so sure you can clamp down 2.75" to 2.5".....maybe...but that's a lot of metal to move. Maybe someone else that has done this or knows a lot more about pipes can chime in.
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Old 06-11-2013, 05:34 PM   #19
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http://www.summitracing.com/search/d...s-and-reducers
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Old 06-11-2013, 05:39 PM   #20
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That's where I was looking.
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Old 06-11-2013, 05:59 PM   #21
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That's where I was looking.
This is the best scenario. Put the headers on in the morning or your next off day take it to a Velasquez muffler shop, these guys are all over the city. Ask them to make you a mid pipe that will go onto a 3"(your header collector) to a 2.5 (your catback) and stay catless. Then sell your catted midpipes. The guys at Velasquez shouldn't really care. If they can't which they can cause they have done that for me many times, then just have them mod your midpipes to BOLT or SLIP right in allowing you to remove them. Please please be careful with the rear bumper, the 2 holes where the tips come out of are very weak. Just FYI.
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Old 06-11-2013, 06:14 PM   #22
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Actually now thinking about it a local shop did a catless connection for my uncles vet. They won't install it but if you give them the dimensions they will build it to your specs.
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Old 06-11-2013, 06:26 PM   #23
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Actually now thinking about it a local shop did a catless connection for my uncles vet. They won't install it but if you give them the dimensions they will build it to your specs.
Why not put the reducer after the 3" cats? ... I don't think a muffler shop would have a problem doing that at all.

Or do you just want to go catless?
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Old 06-11-2013, 06:27 PM   #24
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Open headers... straight pipe... same thing right? Solo Mach XL is just straight pipes with J pipes. is it not?

I can't wait for the looks!
Not quite! Open headers as in No cut outs, no exhaust whatsoever. Just headers! It's louder than straight pipe. It busted off like my 67 Camaro did! Very loud!
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Old 06-11-2013, 06:32 PM   #25
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Yeah my last car was a G8 GT with DT tri y's catless. Only time I smelled anything even remotely was if I was sitting in traffic with the windows down and had a tail wind.

I was thinking that there would have to be some cutting but I did some searching and I found a 3in (outside Diameter) to 2.75in (Inside diameter) adapter.

If what I'm thinking is right the 3in outside diameter should fit inside the catted connection pipe (3in) and the 2.75in inside diameter should fit over the 2.5in exhaust and I can just clamp them together?
Mine smells constantly, but I love it.
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