Quick exhaust question! Real quick!

1308 Views 11 Replies 5 Participants Last post by Bueller, Apr 1, 2009

SvB4EvA

Discussion Starter · Mar 31, 2009

OK, I have a 3.6L CTS not a V, but I am asking this here because there is def. more gearheads in here.

I am doing a custom exhaust. I am going with 2.25" pipe. What size inlet/outlets would be the norm on a muffler/x-pipe for 2.25" pipe? Do I order the same size 2.25" and then they are clamped/welded like that? OR do I order 2.5" inlet/outlets on mufflers/x-pipe so the 2.25" can slide INTO the mufflers/x-pipe?

I would call my installer and ask him, but hes closed for the night.

Thanks! :thumbsup:

(dont make fun of my little 3.6

haha)

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heavymetals

· #2 · Mar 31, 2009

Minimum I would go to is a 2.5" pipe.

You want to get even better, find someone with a CTS-V that has the stock exhaust off theirs.

A lot of the CTS guys bolt these right up.

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SvB4EvA

Discussion Starter · #3 · Mar 31, 2009

heavymetals said:
Minimum I would go to is a 2.5" pipe.

You want to get even better, find someone with a CTS-V that has the stock exhaust off theirs.

A lot of the CTS guys bolt these right up.

I think you missed the point of my question.

I just want to know what size muffler inlet I should get if I want a 2.25" pipe connected to it.

I just dont know if I should get 2.25" and then they weld it on like that directly.

Or do I get 2.5" inlet so the 2.25" pipe slides into it.

OR is it preference of the installer?

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heavymetals

· #4 · Mar 31, 2009

Most muffler shops have an expander that widens the diameter by hydraulic force so the worker can slip fit together then weld.

If you get all the same diameters they will either do it that way put a sleeve over both then weld (very hokey).

If your 2.5 muffler joint is a tight fit around the 2.25 feed, then thats great and the guy can just weld it up and wont need the stretcher.

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rand49er

· #5 · Mar 31, 2009

SvB4EvA said:
... (dont make fun of my little 3.6 haha)

Not at all! Great motor! :highfive:

Good luck with your exhaust.

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SvB4EvA

Discussion Starter · #6 · Mar 31, 2009

rand49er said:
Not at all! Great motor! :highfive:

Good luck with your exhaust.

Thanks a lot rand49er!

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CTSV_510

· #7 · Apr 1, 2009

What is the thickness of the pipe wall? If you want to put 2.25" ID pipe into a 2.5" ID pipe/muffler, then if the pipe wall thickness is 1/8" then you should have a nice fit and I would think a band clamp would tighten it up just perfectly.

That's just my $0.02, I've never done it before.

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heavymetals

· #8 · Apr 1, 2009

If you had a wall thickness of 1/8" that would be some pipe!

(sewer pipe)

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SvB4EvA

Discussion Starter · #9 · Apr 1, 2009

CTSV_510 said:
What is the thickness of the pipe wall? If you want to put 2.25" ID pipe into a 2.5" ID pipe/muffler, then if the pipe wall thickness is 1/8" then you should have a nice fit and I would think a band clamp would tighten it up just perfectly.

That's just my $0.02, I've never done it before.

I know what your saying, but that is a dimension that is not even given.

I think heavymetals hit it on the head when he reminded me that they use a machine that widens the pipe to fit over the inlets/outlets.

I will know for sure when I can call my installer tomorrow.

According to the POWER seller I bought from on eBay, he says " They will just weld the pipe directly to the muffler instead of sliding it in. You ordered the right one. Thanks, Jay"

What ever, I'm confident my installer will make it work. Hes managed a exhaust shop for 15 years and a mechanic for Delta Airlines for 20!

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heavymetals

· #10 · Apr 1, 2009

No way would any reputable shop do a butt weld on an exhaust pipe connection to another pipe.

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CTSV_510

· #11 · Apr 1, 2009

heavymetals said:
If you had a wall thickness of 1/8" that would be some pipe!

(sewer pipe)

I just looked at a ruler. :lol: You're right, it sounded a lot smaller that it actually is!

I guess that proves that 2.25" --> 2.5" pipe is NOT the way to go.

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Bueller

· #12 · Apr 1, 2009

Just to summarize what has been said above 2.25 pipe for 2.25 muffler.

The installer will make it work.

You can most likely get a V exhaust for close to, if not, free if you found one locally. Bolt it right up (2.5")

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