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Old 04-23-2020, 06:55 PM   #1
RupertPupkin

 
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3 inch all round or NO?

I know a fair amount of boosted owners keep the 2.5 setup. You guys think I should upgrade to 3” cat back with custom mufflers for 800$-ish for just keep the 2.5” w/ my NPP muffler mod setup?
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Old 04-23-2020, 08:25 PM   #2
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I'm interested in the response to this question. I just ordered a full exhaust system minus the mufflers from ARH. I have a set of NPP mufflers already but I was wondering how much would the car benefit from the 3 inch piping or is it just for show.
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Old 04-23-2020, 08:33 PM   #3
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3" spintech here....
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Old 04-23-2020, 08:40 PM   #4
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3" spintech here....
Think you got a HP/TQ increase from it?
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Old 04-23-2020, 08:54 PM   #5
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There are gains to be had but i don't think it's necessary until you are pushing over 750whp. But no i couldn't tell you unless i upgraded. I was talking to Ted about it and i don't remember the numbers he told me exactly. 102mm throttle body i know he said world be worth 15hp. I want to say 2"headers and 3" exhaust he said would gain me about the same.
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Old 04-23-2020, 08:56 PM   #6
RupertPupkin

 
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From previous threads I’ve read, and YouTube vids, there are benefits. However, to see the most result, you have to be pushing some good power. I’m going to be in the 750-800rwhp range.

I’m just curious to see why some guys here keep the 2.5 setup with their FI build.


I did see these.. https://www.speed-engineering.com/sh...s-1le-zl1.html

Not bad for 500$. I’ve had my fair share of bullet mufflers. Love the sound (depending on brand), didn’t mind the drone, but they did drone ALOT!!
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Old 04-23-2020, 08:58 PM   #7
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Originally Posted by Greenhornet2 View Post
There are gains to be had but i don't think it's necessary until you are pushing over 750whp. But no i couldn't tell you unless i upgraded. I was talking to Ted about it and i don't remember the numbers he told me exactly. 102mm throttle body i know he said world be worth 15hp. I want to say 2"headers and 3" exhaust he said would gain me about the same.
15 hp... not worth it in my book.
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Old 04-23-2020, 09:13 PM   #8
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At 750-800whp it may be more. There is a full 3" set up for like $300 on amazon.... i almost bought it.
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Old 04-24-2020, 08:40 AM   #9
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Originally Posted by Greenhornet2 View Post
At 750-800whp it may be more. There is a full 3" set up for like $300 on amazon.... i almost bought it.
290$ + free shipping.

I would have to swap out to the quad exhaust tips, and maybe the muffler. Great price though.
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Old 04-24-2020, 10:53 AM   #10
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Upgrading the exhaust is my project for next year, I was thinking 1 7/8" LTs and a 3" exhaust. I wonder if the size of the LTs would impact your exhaust selection, if you have 1 7/8" headers go with 2.5" exhaust, or if you have 2" headers go with 3" exhaust. Would a 3" exhaust on 1 7/8" headers be a waste?
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Old 04-24-2020, 12:21 PM   #11
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https://www.camaro5.com/forums/showthread.php?t=400900
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Old 04-24-2020, 12:32 PM   #12
RupertPupkin

 
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Thanks for the link.

Who tf said you gained 50 w/ 3”... it was in 1 of the old threads. What muffler did you have? I think that should be the limiting factor, if they’re restrictive.
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Old 04-24-2020, 01:23 PM   #13
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Old 04-24-2020, 04:01 PM   #14
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Quote:
Originally Posted by Greenhornet2 View Post
There are gains to be had but i don't think it's necessary until you are pushing over 750whp. But no i couldn't tell you unless i upgraded. I was talking to Ted about it and i don't remember the numbers he told me exactly. 102mm throttle body i know he said world be worth 15hp. I want to say 2"headers and 3" exhaust he said would gain me about the same.
Agree here. I am running 3" corsa extreme with longtubes. Dont think its worth much of anything over the 2.5 until you are moving some serious air.
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