Exhaust - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

Roasstum1 · 08-12-2016, 09:30 AM

Will I net any horsepower at all from noweeds? I've seen somewhere it will gain a few hp is this true?

Dizzy82 · 08-12-2016, 11:34 AM

From cat back you may gain some HP, axle back is strictly for sound.

jcamaro · 08-12-2016, 11:43 AM

A full exhaust system (cat back) will net you a few BHP but negligible effect to RWHP. Unless you change headers and cats, you won't notice a difference other than sound.

Demon War Horse · 08-12-2016, 12:00 PM

Most exhaust changes other than headers are purely for sound benefits. Going to long tubes and a tune is where you will gain the most.

Pic you exhaust mods based on how you like the sound. Any HP aside from the headers will never be felt and dyno numbers are subjective (every dyno and day may yield different results) and are for bench racing.

bkscott · 08-12-2016, 12:17 PM

If I am not mistaken he is asking about cutouts not catbacks.....there was a video a few years ago of a car with them installed the dynode and it picked up some hp. Not sure of the exact amount....

Roasstum1 · 08-14-2016, 09:13 PM

thankyou guys!! really thinking of doing this mod over the winter

CamaroFred · 08-14-2016, 10:06 PM

The Corvette is certified to gain 6HP at the crank with the NPP (open) exhaust.

Anecdote:
Around 1976 my brother an I chipped in to buy an old Dodge Coronet police car. We parted it out and made a few dollars.

But what my brother wanted were the suitcase mufflers that we welded onto flanges to connect directly to the headers on his 440 Plymouth GTX. We could drop them with three bolts on each side.

So we are tripping up to the drag strip one Saturday and a sheriff is sitting under a bridge (shade, you know). My brother is right on the 70MPH limit, but the car has a 4.10 screw so it's winding ~3500 RPMs. He gets pulled, I stop and walk over and the LEO says' "Your car is too loud." My brother responds, "No, it isn't." The LEO says, "Start it up." "It's running." "Rev it up." You could hear the solid lifters over the whoosh from the exhaust.

The LEO put his sunglasses back on, walked to his car, and took off without another word.

I will take the 6HP loss just to have another encounter like that before I die.

Magna_Flow · 08-17-2016, 04:33 PM

In our experience, short pipes or cutout systems usually make less horsepower than a full exhaust. If you are looking for more than just volume gains from them, you may be disappointed.

SSdude · 08-17-2016, 04:50 PM

Quote:

Originally Posted by Roasstum1

thankyou guys!! really thinking of doing this mod over the winter

Do it for the sound alone.. It is that freaking awesome.

I am on year 5 with self installed noweeds and have not run into a single problem yet.

Predator2U · 08-17-2016, 05:08 PM

Quote:

Originally Posted by SSdude

Do it for the sound alone.. It is that freaking awesome.

I am on year 5 with self installed noweeds and have not run into a single problem yet.

Totally Agree... I installed NOWEEDS myself two months ago and couldn't be happier. No HP gains or losses noticeable but the sound is terrific!
I constantly get comments of how "mean" she sounds.

Just looking at other driver's facial expressions when I pull up to a light with open diverters. --> Priceless

My only complaint is that it took 6 weeks from order to receive them... otherwise 100% satisfied

08-12-2016, 09:30 AM	#1
Roasstum1 EbonyCamaro Drives: Black SS 14 Join Date: Aug 2014 Location: Kansas Posts: 337 View My Garage	Exhaust Will I net any horsepower at all from noweeds? I've seen somewhere it will gain a few hp is this true?

08-12-2016, 11:34 AM	#2
Dizzy82 Drives: 2011 1LT/RS A6 RJT SuperCharged Join Date: Mar 2011 Location: 87114 Posts: 3,503 View My Garage	From cat back you may gain some HP, axle back is strictly for sound. __________________ Power is worthless without control. *The 2nd* protects the 1st.** BMR sub frame brace, BMR tunnel brace, LSR sways, LSR CM ca & tl, Sphon ExD el, GM tower brace, Megan EZ Streets, Goodridge Stainless Steel Braided brake lines, PowerStop D/S rotors & pads, Doug Thorty Ceramic Shorties, Magnaflow x-pipe, MRT V2.0, KICKER PowerStage sub & amp, Infinity speakers & tweeters, Viteese Throttle Controller, Viteese Paddle Shifters, ACS T2 Splitter, ACS T2 Ports/Quad LED lights, VDI kit, Havoc diffuser, IPF ECU/TRANS tuned, IPF/KPE Supercharged. 364RWHP/297RWTQ

08-12-2016, 11:43 AM	#3
jcamaro Obsessed Much? Drives: 2015 Silver 1SS/RS M6 Join Date: Aug 2009 Location: Las Vegas Posts: 934	A full exhaust system (cat back) will net you a few BHP but negligible effect to RWHP. Unless you change headers and cats, you won't notice a difference other than sound. __________________ 2015 1SS RS M6

08-12-2016, 12:00 PM	#4
Demon War Horse War Horse Pilot Drives: 2017 NFG 1SS 1LE Join Date: Jul 2014 Location: N.Texas Posts: 2,458 View My Garage	Most exhaust changes other than headers are purely for sound benefits. Going to long tubes and a tune is where you will gain the most. Pic you exhaust mods based on how you like the sound. Any HP aside from the headers will never be felt and dyno numbers are subjective (every dyno and day may yield different results) and are for bench racing. __________________ COTW 09/07/2015 - 2014 AGM 2SS/RS - RIP 6/01/17 2017 Nightfall Gray Metallic 1SS 1LE Born 5/17/17 - *Click Sig Pic below for for Demon War Horse 02 Build Thread* SigPic by Hazman

08-12-2016, 12:17 PM	#5
bkscott Drives: 2010 Camaro 2SS/RS Join Date: Dec 2009 Location: Grand Prairie, Texas Posts: 1,608 View My Garage	If I am not mistaken he is asking about cutouts not catbacks.....there was a video a few years ago of a car with them installed the dynode and it picked up some hp. Not sure of the exact amount.... __________________ 94 Firebird Formula (Drowned 08/30/05) 2010 IBM 2SS/RS 6M Arrived 3/25/10. ADM CAI, Borla Type S Cat Back, VMAX Ported TB, LG Short Throw Shifter, 1LE Shocks, Hotchkis Sway Bars, Whiteline Cradle Bushing Inserts, Custom Powdercoated ZL1's ,Michelin Pilot Supersports, Stainless Power Headers, Solo J Pipes, AAC LED Sidemarkers, ZL1 Rockers, SLP Splitter, ADM Stage II Cam,ZL1 Diffuser,Vitesse Throttle Controller.

08-14-2016, 09:13 PM	#6
Roasstum1 EbonyCamaro Drives: Black SS 14 Join Date: Aug 2014 Location: Kansas Posts: 337 View My Garage	thankyou guys!! really thinking of doing this mod over the winter

08-14-2016, 10:06 PM	#7
CamaroFred Drives: Miss Con Ception Join Date: Aug 2016 Location: Chicagoland Posts: 2,998	The Corvette is certified to gain 6HP at the crank with the NPP (open) exhaust. Anecdote: Around 1976 my brother an I chipped in to buy an old Dodge Coronet police car. We parted it out and made a few dollars. But what my brother wanted were the suitcase mufflers that we welded onto flanges to connect directly to the headers on his 440 Plymouth GTX. We could drop them with three bolts on each side. So we are tripping up to the drag strip one Saturday and a sheriff is sitting under a bridge (shade, you know). My brother is right on the 70MPH limit, but the car has a 4.10 screw so it's winding ~3500 RPMs. He gets pulled, I stop and walk over and the LEO says' "Your car is too loud." My brother responds, "No, it isn't." The LEO says, "Start it up." "It's running." "Rev it up." You could hear the solid lifters over the whoosh from the exhaust. The LEO put his sunglasses back on, walked to his car, and took off without another word. I will take the 6HP loss just to have another encounter like that before I die.

08-17-2016, 04:33 PM	#8
Magna_Flow Drives: 2015 ZL1 Join Date: Jan 2015 Location: Oceanside, CA Posts: 313	In our experience, short pipes or cutout systems usually make less horsepower than a full exhaust. If you are looking for more than just volume gains from them, you may be disappointed.