Header reducer question....

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Jun 14, 2007 | 08:41 PM

carriker

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Pro

Joined: Mar 2005

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From: College Station Texas

Header reducer question....

When I asked for header reducers from NAPA in 3"-2.75" they said that those don't exist. Is this true? Aren't our pipes 2.75"? That's what I have always thought anyway. Maybe they are 2.5???? What do you guys use to connect the headers to the rest of the exhaust system???
Thanks, Matt

Jun 14, 2007 | 08:58 PM

Demonic85

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From: sw Ohio

There are no exhaust pipes in 2.75". All LT1 vettes have 3" exhaust pipe.

Jun 14, 2007 | 09:17 PM

Corvette Kid

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From: Good health is merely the slowest possible rate at which one can die

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Quote:

Originally Posted by 4Ever21

There are no exhaust pipes in 2.75". All LT1 vettes have 3" exhaust pipe.

Wrong. LT1/4s indeed have 2.75" systems. My aftermarket PE system is also 2.75".
Carriker, any decent exhaust shop should be able to fix you up.

Jun 14, 2007 | 09:22 PM

Steve85

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From: Winchester VA

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Quote:

Originally Posted by Corvette Kid

Wrong. LT1/4s indeed have 2.75" systems. My aftermarket PE system is also 2.75".
Carriker, any decent exhaust shop should be able to fix you up.

The shop should have an expander that will make the end of your 2.75" blow up to 3". It's not the prettiest thing in the world but effective.

Jun 14, 2007 | 09:25 PM

VMAX451

Burning Brakes

Joined: Aug 2000

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From: Cincinnati OH

I was never able to find any 3->2.75 reducers. Some people just slip 3" extensions over the 2.75" pipe and weld it on. Only downside there is that you then have a "step" in the wrong direction, if it matter any. You could use a 3->2.5 reducer and chop it at its mid-point, then weld directly to your 2.75 pipe.
Lots of possibilities, but yeah, the 2.75 is definitely an odd size.

Jun 14, 2007 | 09:47 PM

aboatguy

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From: Slidell Louisiana

Quote:

Originally Posted by Corvette Kid

Wrong. LT1/4s indeed have 2.75" systems. My aftermarket PE system is also 2.75".
Carriker, any decent exhaust shop should be able to fix you up.

I went to a shop it didn't cost too much and it looks much better than what I would have cobbled together.

Jun 14, 2007 | 10:25 PM

LouisvilleLT4

Drifting

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From: Los Angeles California

My collectors end in a three-bolt flange that I want to bolt up to my main exhaust so I can separate the two when needed. In fabricating this reducer, could an exhaust shop also make it boltable to that collector flange?