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Old 08-17-2013, 04:15 PM   #1
Levischilz
 
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To change exhaust for TT setup or not..

I currently have stock exhaust except muffler delete. Does anyone know what may change after I get the twin turbo setup in place?

Im using the AGP TT kit. I know that the car to me with the muffler delete is not loud (ls3).

I know our cat's muffle quite a bit. I also know that turbo's will muffle the exhaust.
A. How do you think the exhaust will be in terms of volume compare to now? The cats are going away with the turbo install.

B. Is it worth the money to change to a 3" system now while doing the turbo system install. I know it may help relieve pressure on the exhaust side of the turbo. I dont care about the couple hp but more turbo spool time etc vs the factory 2.5 system.


Any feedback would be great. I dont want to spend the money this second since I just ordered the kit but at the same time debating if its better to do it before I get it tuned.

Thanks Levi
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Old 08-17-2013, 04:47 PM   #2
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Should be quieter than before, or at least I would think so.

3" exhaust will be worth it.
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Old 08-17-2013, 04:48 PM   #3
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do you think it would need to be retuned if i changed from 2.5 to 3" if I waited?
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Old 08-17-2013, 05:26 PM   #4
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do you think it would need to be retuned if i changed from 2.5 to 3" if I waited?
Yes, any change in air flow needs a tune. If you want the car optimized.
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Old 08-17-2013, 05:30 PM   #5
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3" exhaust won't help spool up very much, you won't have enough exhaust flow for it to make a difference, unless you are going to make a lot of power.
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Old 08-17-2013, 06:28 PM   #6
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I think he means 3" post turbo..that would help no?
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Old 08-17-2013, 06:34 PM   #7
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Ya right now just looking at 650ish rwhp
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Old 08-17-2013, 07:11 PM   #8
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3" will help, not night and day but it will spool quicker.

Yes retune it. Boost will come on faster and you will be moving more air.
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Old 08-20-2013, 10:49 PM   #9
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Glad to see this post here - I am imminent on the AGP install on my (mostly) stock 2013 2SS/RS LS3 and will be meeting with the speed shop team this Friday to discuss the install.

I had been wondering if the AGP TT implied any specific implications for exhaust.

I am leaning towards the Tri-Y Headers from Pfadt for low-mid-range torque gains (DD and circuit car, not a 1/4 mile build) and was still heavily debating the (cat-back) exhaust. If it matters, I have the Dual-Mode Performance Exhaust.

Anything specific to the AGP TT build that would go into the header/exhaust decision? Performance? Fit (as in not interfering with the TT Kit)?
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Old 08-20-2013, 10:56 PM   #10
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Quote:
Originally Posted by HarryNW View Post
Glad to see this post here - I am imminent on the AGP install on my (mostly) stock 2013 2SS/RS LS3 and will be meeting with the speed shop team this Friday to discuss the install.

I had been wondering if the AGP TT implied any specific implications for exhaust.

I am leaning towards the Tri-Y Headers from Pfadt for low-mid-range torque gains (DD and circuit car, not a 1/4 mile build) and was still heavily debating the (cat-back) exhaust. If it matters, I have the Dual-Mode Performance Exhaust.

Anything specific to the AGP TT build that would go into the header/exhaust decision? Performance? Fit (as in not interfering with the TT Kit)?
You can't use the Pfadt headers with a turbo kit unless you are using rear mount turbos. You will reuse your stock manifolds with the turbos. The turbos will give you plenty of low and mid range power.

I do not know if you will be able to use your dual mode exhaust with the turbo kit. I don't see why not but I have no experience with it.
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Old 08-20-2013, 11:04 PM   #11
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Glad I brought it up now then - will not be a factor in the meeting this week, thanks for the quick reply.

With the stock headers then, why does it not make the 2.5" vs 3" conversation mute? If the output from the manifold is stock, and the cat is eliminated, why would a larger exhaust be beneficial? Like the original OP, I will be tuning for an identical 650 RWHP target.
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Old 08-20-2013, 11:10 PM   #12
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It is a pressure issue. The larger exhaust will have less back pressure. As Unreal said, you will spool slightly quicker. If I were you, save some money and go with your stock exhaust. It won't make any difference at the 650rwhp level. If, down the road, you decide to pour the coals to it, invest in larger exhaust. Right now, save your money for fuel, tires, and a clutch.
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Old 08-20-2013, 11:20 PM   #13
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IPS tested taking the exhaust off and gained 50 or so whp in the 600 range. I would say exhaust would make power but upping the boost would be cheaper.
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Old 08-20-2013, 11:32 PM   #14
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Sage advice, and thanks again.

BTW - anyone reading this thread should also read the Article on Exhaust Science provided in this thread. I think the most relevant quote on exhaust/muffler selection , as mentioned by others is:

Quote:
Knowing that 2.2 cfm per open-pipe hp means zero loss from backpressure allows us to determine how much muffler flow your engine needs. Just make a reasonable estimate of its open exhaust power potential and multiply by 2.2. For instance, a V-8 making 500 horsepower on open exhaust will require 500 x 2.2 = 1100 cfm. Two 550-cfm mufflers will get the job done and contain the backpressure-induced power loss to 5 horsepower or less. With mufflers rated in cfm, see how easy making an appropriate choice gets?
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Old 08-20-2013, 11:44 PM   #15
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Glad I brought it up now then - will not be a factor in the meeting this week, thanks for the quick reply.

With the stock headers then, why does it not make the 2.5" vs 3" conversation mute? If the output from the manifold is stock, and the cat is eliminated, why would a larger exhaust be beneficial? Like the original OP, I will be tuning for an identical 650 RWHP target.
Solid 3" exhaust and a boost controller to set it to 9-10psi and you are set. Besides that look at a clutch, tires, suspension, etc.
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Old 08-21-2013, 12:47 PM   #16
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I went with the 3" Magnaflow catback and all I needed to modify was to remove the reducer and weld a 3' pipe on the end of the downpipe. The reducer was put there to mate with the stock 2.5" exhaust.
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Old 08-21-2013, 01:29 PM   #17
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On turbo vehicles you need to get the exhaust out as fast as you can. that's why you see 5" exhausts on semis, and HD trucks. for a N/a vehicle it's not as important to have larger pipes. in some cases going to a Massive exhaust (example 4"+) you will see a power loss.
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Old 08-21-2013, 02:23 PM   #18
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I noticed very little difference on my truck going from 4" tothe 5" I run now. Just sounds better is all really. Smae thing on the STi I had before, spool up wan't really changed that much.
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Old 08-21-2013, 06:50 PM   #19
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I was told 2.5 inch is good to 700HP. I have the magnaflow comp. cat-back and dont plan on changing it for the AGP TT's 650-700hp is good for me. If I want to turn up the wick I will upgrade till then I will save the pennies.
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Old 08-23-2013, 09:53 AM   #20
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there is no downside to going to a larger exhaust at all. As stated with a turbo, you want to exit the exhaust as quickly as possible.

Maybe something you could do is look into cut offs. Have them installed shortly after the turbos. Would be cheaper than a full 3 inch exhaust and will be even better performance wise.

I run a twin turbo setup with a full stock exhaust, no mufflers, and no cats... now my turbos are rear mounted so the sound is a little more noticeable... but regular driving the car sounds really good. Not too loud, but loud enough that people know you are coming, but when going WOT... totally different story.
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Old 08-23-2013, 10:04 AM   #21
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I was told 2.5 inch is good to 700HP. I have the magnaflow comp. cat-back and dont plan on changing it for the AGP TT's 650-700hp is good for me. If I want to turn up the wick I will upgrade till then I will save the pennies.
I would agreed with that. If you are stock and upgrading do a full 3". If you already have that, it will support more then enough power.
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Old 08-24-2013, 09:08 AM   #22
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i kept my stock exhaust with the muffler delete and added a 3" race ready e/cutout love how i can just make it go loud whenever i want and stay low profile when i cruise
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