08-19-2013, 06:06 PM | #1 |
Drives: 2013 1LE Join Date: May 2013
Location: NJ
Posts: 685
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How much HP 2.5 exhaust?
How much HP will 2.5 exhaust support in a N/A car?? Was wondering if it was worth it to go with a full 3in. system. Thanks.
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08-19-2013, 07:24 PM | #2 |
Drives: 2010 Cyber Grey Camaro SS (LS3) Join Date: Mar 2010
Location: Clarksville TN
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Zero. The factory exhaust is 2.5'', and flows pretty well. There is almost no gain to be had in 2.5'' exhaust. 3'' is overkill on an N/A motor unless you have some bigger cubes, high flowing heads and a beastly cam.
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08-19-2013, 07:25 PM | #3 |
Geek
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IIRC the stock system is good to ~600RWHP. Then the 3" is not just for sound anymore.
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08-19-2013, 07:27 PM | #4 |
Drives: '69 SS Convertible Join Date: May 2009
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You won't get a true 3" system unless you buy one. I think KOOKS and LG are about the only ones that make a full header to exhaust tip in 3".
Most headers and cat-backs have a 2.5" connection point. Unless you're making really big HP I wouldn't worry about going to a full 3" system. However, a 3" will give you a little bit of deeper tone when idling.
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08-19-2013, 07:27 PM | #5 |
Drives: 2010 Cyber Grey Camaro SS (LS3) Join Date: Mar 2010
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I stand corrected OP! You're gonna need a whole LOT of cubes then lol.
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08-19-2013, 07:31 PM | #6 |
Drives: G8GT Join Date: Jan 2011
Location: Vermont
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the magic number is 2.2cfm /HP. Any more flow is a waste of money.
Here is a decent unbiased article with science behind exhaust system design
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08-19-2013, 07:33 PM | #7 | |
Geek
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Quote:
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x = ac97968bd3df8f968c8cd3df998a9c94d3df9c8a918bd3df9c 909c94df8c8a9c949a8dd3df92908b979a8ddf998a9c949a8d d3df8b968b8cd1 x = ~x |
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08-19-2013, 08:07 PM | #8 |
chevy pride
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n/a i dont think the gains will be but like 1-2 hp if that. the weight of the extra pipe. will counter balance that tho lol
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08-19-2013, 08:25 PM | #9 |
Drives: 2013 1LE Join Date: May 2013
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Thanks for the replies. Looks like it's not worth changing to 3in.
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08-19-2013, 08:34 PM | #10 |
Geek
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Sure it is. A 3" sounds like heaven on these cars.
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x = ac97968bd3df8f968c8cd3df998a9c94d3df9c8a918bd3df9c 909c94df8c8a9c949a8dd3df92908b979a8ddf998a9c949a8d d3df8b968b8cd1 x = ~x |
08-19-2013, 08:52 PM | #11 |
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JRE has an 800 rwhp on the 2.5" exhaust. Blower car though
I run the Kooks 3". It does sound evil at the track! |
08-19-2013, 09:19 PM | #12 | |
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Quote:
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08-20-2013, 10:07 AM | #13 |
Drives: '69 SS Convertible Join Date: May 2009
Location: DFW, TX
Posts: 7,111
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Not a true 3". I'm talking about 3" from the collector back.
Most 3" cat-backs have a 2.5" inlet so they can connect up to the stock mid pipes. KOOKS makes a 3" inlet cat-back as well as LG. I think ARH might have one setup that way as well.
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-2010 Camaro 2SS | M6 | VR w/White Stripes | 1 3/4" KOOKS - 3" Magnaflow | LPE 3.91 gears | ADM tuned | Halltech w/ADM Scoop | Spohn/BMR Trailing Arm/Toe Rod | BC Coilovers| Pedders FE4 ZL1 swaybars | Cradle/Diff/Radius Rod bushings | VMax TB | Morimoto Projectors | MGW shifter | Red Calipers
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08-20-2013, 12:32 PM | #14 |
Geek
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And so does JBA. And so does SW. I know what you're talking about. I just know there are plenty of full 3" choices .
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x = ac97968bd3df8f968c8cd3df998a9c94d3df9c8a918bd3df9c 909c94df8c8a9c949a8dd3df92908b979a8ddf998a9c949a8d d3df8b968b8cd1 x = ~x |
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