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

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Old 01-11-2014, 09:37 AM   #1
T-r3x
 
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Supercharger + 3" x pipe + 2.5" axle back, good or bad?

Hey guys!

I'll get my supercharger installed next week and I have a question
I have an ARH installed and a 2.5" Borla cat-back.
I was wondering if I can get a ARH 3" pipes with X pipe and weld the 2.5" Borla Axle back to it to increase the air flow of the exhaust.

Just like in this pictures





Will that effect the air flow of the exhaust in a good way? specially with the supercharger?
Is it good to do what I'm planing to do ,or should I just keep my 2.5" cat back?

please let me know what's the best choice :no idea:

Thanks guys!

Last edited by T-r3x; 01-11-2014 at 09:55 AM. Reason: Adding pics
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Old 01-11-2014, 11:58 AM   #2
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Unless you are going 700 whp, I wouldn't worry about it.
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Old 01-11-2014, 02:03 PM   #3
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2.5" pipe is fine for your mod's and for most mods beyond that. No point in swapping out in my opinion.
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Old 01-11-2014, 02:11 PM   #4
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I have to disagree. 2.5 inch is ok on my N/A bolt-on 03 Mustang GT. But 3 inch is better on my Camaro. I'd say go 3 inches all the way back.
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Old 01-11-2014, 02:17 PM   #5
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Supercharger + 3" x pipe + 2.5" axle back, good or bad?

You might as well go 3" all the way, especially if you plan to add more power later.
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Old 01-11-2014, 02:35 PM   #6
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I'm running the similar setup but LG headers with 3" x-pipe necked down to the stock L99 mufflers 2.5" so far so good.
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Old 01-11-2014, 04:03 PM   #7
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Adding a 3in X pipe won't increase flow if the piping after it is 2.5in. Your exhaust will only flow as much as the narrowest point will allow. If you want more flow, you'll have to go 3in all the way back.
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Old 01-11-2014, 04:47 PM   #8
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Quote:
Originally Posted by T-r3x View Post
Hey guys!

I'll get my supercharger installed next week and I have a question
I have an ARH installed and a 2.5" Borla cat-back.
I was wondering if I can get a ARH 3" pipes with X pipe and weld the 2.5" Borla Axle back to it to increase the air flow of the exhaust.

Just like in this pictures





Will that effect the air flow of the exhaust in a good way? specially with the supercharger?
Is it good to do what I'm planing to do ,or should I just keep my 2.5" cat back?

please let me know what's the best choice :no idea:

Thanks guys!
It can be done but there isn't really any point if you are only doing part of the exhaust in 3 inch. Do 3 inch all the way back or leave it as is.
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Old 01-11-2014, 07:11 PM   #9
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I forget who told me this.. 14pilot maybe? A small neck down... say a 3" to 2.5" midpipe, back into a 2.5" to 3" flare UP to a 3" catback can actually be beneficial for low-end torque. Helps get the velocity up right out of the headers at low RPM, but still no restriction back to the wheels for high end flow.
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Old 01-12-2014, 08:26 AM   #10
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Looks like i'm going to keep my 2.5"
Thanks all
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Old 01-12-2014, 11:05 AM   #11
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Does the power difference worth paying about $1500 for a new 3" cat back instead of my 2.5"?
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Old 01-12-2014, 11:20 AM   #12
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I gained going from 2.5 to 3 but it was the stock catback I was replacing. If I already had an aftermarket 2.5 catback I wouldn't worry with it.
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Old 01-12-2014, 04:02 PM   #13
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I gained going from 2.5 to 3 but it was the stock catback I was replacing. If I already had an aftermarket 2.5 catback I wouldn't worry with it.
DO YOU THINK I'LL GET MUCH MORE POWER WITH THE 3" CATBACK?
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Old 01-12-2014, 04:54 PM   #14
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DO YOU THINK I'LL GET MUCH MORE POWER WITH THE 3" CATBACK?
NO!
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Old 01-12-2014, 05:40 PM   #15
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DO YOU THINK I'LL GET MUCH MORE POWER WITH THE 3" CATBACK?
Why caps lock chief?

Anyway, I don't think ANY exhaust is worth $1500. Bo White and myself both have OBX exhaust which is 3 inch and only costs a little over $500. And there are other brands that cost about the same. Most of them neck down to a 2.5 inch at the connection for the HF cat/catless extension but that isn't much of a big deal. And you can always weld in some 3 inch piping to get rid of where it necks down.
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Esmeralda (03 GT) - UDP, CAI, PP intake manifold/upper plenum/75mm TB, 4.10s, fully rebuilt/upgraded trans w/ Transpak, 2400 stall converter, full O/R exhaust, 04 Cobra tank/dual 255 LPH pumps, Sniper Tune!!

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Old 01-15-2014, 08:14 PM   #16
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Your setup is perfect. Nothing to be gained from 3" all the way except for some more weight on your car, and less weight in your wallet. Don't wasted your time or cash on the 3".
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Old 01-15-2014, 08:52 PM   #17
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Your setup is perfect. Nothing to be gained from 3" all the way except for some more weight on your car, and less weight in your wallet. Don't wasted your time or cash on the 3".
Nothing but tone that is.
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