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Any negative side-effects from raising the rear 1 or 2 inches for exhaust clearance?

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Old 12-23-2012, 06:06 PM
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Any negative side-effects from raising the rear 1 or 2 inches for exhaust clearance?

So, now that my engine is done, I need to work on the rear. I'm swapping the 2.73s for 4.11s, but also, would like the rear to look a *bit* more aggressive.

Then I remembered that my exhaust guy said it would be too hard fitting 3 inches over the rear axle, and we settled on ending the exhaust with a glass pack and a downward angle just before the rear axle. Well, it's a tad too loud for a DD imo, and would definitely like to go back to the original plan of putting the 3 inches over the axle, and maybe into a 1 in, 2 out muffler.

I figured that maybe if I raise the rear an inch or two, that would be plenty of clearance for the exhaust, and would make the rear look a tad more aggressive.

Anyone ever seen or done this? Any negative side effects? I figure with only 1 or 2 inches it wouldn't be dramatic enough to look bad, but I can't know unless I see it.
Old 12-23-2012, 06:29 PM
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Re: Any negative side-effects from raising the rear 1 or 2 inches for exhaust clearan

Originally Posted by Zerocyde
Then I remembered that my exhaust guy said it would be too hard fitting 3 inches over the rear axle...
A 3" isn't an issue.

UMI also makes a panhard relocation kit for added exhaust room: 2024.

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Old 12-23-2012, 06:43 PM
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Re: Any negative side-effects from raising the rear 1 or 2 inches for exhaust clearan

Originally Posted by Zerocyde
So, now that my engine is done, I need to work on the rear. I'm swapping the 2.73s for 4.11s, but also, would like the rear to look a *bit* more aggressive.

Then I remembered that my exhaust guy said it would be too hard fitting 3 inches over the rear axle, and we settled on ending the exhaust with a glass pack and a downward angle just before the rear axle. Well, it's a tad too loud for a DD imo, and would definitely like to go back to the original plan of putting the 3 inches over the axle, and maybe into a 1 in, 2 out muffler.

I figured that maybe if I raise the rear an inch or two, that would be plenty of clearance for the exhaust, and would make the rear look a tad more aggressive.

Anyone ever seen or done this? Any negative side effects? I figure with only 1 or 2 inches it wouldn't be dramatic enough to look bad, but I can't know unless I see it.
If he's referring to a dual 3" pipe, that might be an issue.

But a single 3" is factory sized and even 3.5" and 4" single exhaust systems fit if they are done properly.

No reason to raise the car, honestly...
Old 12-23-2012, 07:13 PM
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Re: Any negative side-effects from raising the rear 1 or 2 inches for exhaust clearan

Originally Posted by paul_huryk
But a single 3" is factory sized
What? My new exhaust looks like a monster compared to what was stock. That can't be right.
Old 12-23-2012, 07:38 PM
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Re: Any negative side-effects from raising the rear 1 or 2 inches for exhaust clearan

Originally Posted by Zerocyde
What? My new exhaust looks like a monster compared to what was stock. That can't be right.
IIRC, there was an OE 2 1/2 and a 2 3/4 (often called a 3). My Hooker 3" fits without issue.

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Old 12-23-2012, 07:46 PM
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Re: Any negative side-effects from raising the rear 1 or 2 inches for exhaust clearan

My obx 3" fits no issues
Old 12-24-2012, 10:21 AM
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Re: Any negative side-effects from raising the rear 1 or 2 inches for exhaust clearan

Originally Posted by Zerocyde
What? My new exhaust looks like a monster compared to what was stock. That can't be right.
If you have a 305 TBI, the 2.25" exhaust would look tiny compared to a 3" one.

I have a 3.5" Mufflex cat-back on my Camaro, it is lowered and never had any issues at all.
Old 12-24-2012, 10:25 AM
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Re: Any negative side-effects from raising the rear 1 or 2 inches for exhaust clearan

Originally Posted by paul_huryk
If you have a 305 TBI, the 2.25" exhaust would look tiny compared to a 3" one.
Now that I think about it, my LG4 was equipped with the 2.25. The after market was 2.5, and the L69 was 2.75 (which made the original look pretty scrawny).

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Old 12-24-2012, 12:48 PM
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Re: Any negative side-effects from raising the rear 1 or 2 inches for exhaust clearan

I have a Hooker 3" on my car; fits like a glove. No raising required. Fits exactly in the stock location.

I'd STRONGLY suggest a boxed-set approach from a major mfr like that, as opposed to a "custom" muffler shop setup.
Old 12-24-2012, 02:41 PM
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Re: Any negative side-effects from raising the rear 1 or 2 inches for exhaust clearan

Originally Posted by paul_huryk
If you have a 305 TBI, the 2.25" exhaust would look tiny compared to a 3" one.
Yea, I had the 305 tbi before I built my carbed 355.

Originally Posted by sofakingdom
I have a Hooker 3" on my car; fits like a glove. No raising required. Fits exactly in the stock location.

I'd STRONGLY suggest a boxed-set approach from a major mfr like that, as opposed to a "custom" muffler shop setup.
Can you buy a full, 3 inch, "headers to y-pipe to straight over the axle to catback" that fits with aftermarket headers? I have hooker shorties, with one side different to clear the clutch slave cylinder.
Old 12-24-2012, 03:17 PM
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Re: Any negative side-effects from raising the rear 1 or 2 inches for exhaust clearan

Originally Posted by Zerocyde
Can you buy a full, 3 inch, "headers to y-pipe to straight over the axle to catback"...
Yes. Hooker 2055's with Y-pipe (Jeg's 520-2055). Catco high-flow converter (Summit CTO-9118). Hooker catback (Summit HOK-16823HKR).

The above is direct fit--no modding, cutting, bending, etc.

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Old 12-25-2012, 11:05 AM
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Re: Any negative side-effects from raising the rear 1 or 2 inches for exhaust clearan

Yup.

I have SLP 1¾" headers with their included Y-pipe, a similar Catco cat as James except mine is the 4-bolt-flange one, and I think that same Hooker part # he listed. Bolts up as good as if not better than stock.

Not sure about anything having to do with "slave cylinder" making any difference. The above fits fine with both a T-56 and a T-5. If however, you have some random headers that you already know fail to fit the car, all bets are off. Might be a good idea to start over in that dept with something that actually fits the car, and then exhaust that fits the car will pretty much be a slam-dunk certainty that they'll fit that too.

As far as buying something off-the-shelf to fit whatever random headers you now have, that's impossible to predict. My gut however doesn't feel warm or fuzzy about it.
Old 12-26-2012, 11:37 AM
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Re: Any negative side-effects from raising the rear 1 or 2 inches for exhaust clearan

Find a new "exhaust guy." if he can't fit a stock sized exhaust on the car then he's either incredibly lazy or incompetent.
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