1991 Borla exhaust flow - ZR-1 Net Registry Forums

1991KOTH · 12-30-2016

How well does the Borla exhaust flow? Really like how it looks but may end up buying corsa depending on flow. Buying SW headers for sure though.

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Kevin · 12-31-2016

i think its worse then factory

HAWAIIZR-1 · 12-31-2016

Here is some information from the ZR-1 Specialist:

http://www.zr1specialist.com/HAT%20W...%20Systems.pdf

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Top Toy · 12-31-2016

The new B&B Fusion dual mode exhaust system has the best combination of loud and quiet when open or closed with no resonance. And minimal back pressure when open. But their latest version uses round instead of oval cans which look a little odd on our cars. Corsa is single mode and loud at idle and WOT and fairly low back pressure because it's straight thru on one side but it's only 2 1/2" and the second outlet is completely blocked off. Sound is a bit raspy. Stainless Works has two different versions. The Turbo S is single mode and straight thru on one side like the Corsa but 3" inlet, 2 3/4" thru the tubes and fully open on both sides. One of the least restrictive mufflers for our cars. Deep rumble at idle and cruise. Very loud at WOT. Moderate resonance when lugging up hills. I have no experience with Stainless Works quiet system but assume it's more restrictive.

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XfireZ51 · 12-31-2016

Someone on the Forum has experience w the DynoMax system using an internal
Flapper valve controlled by exhaust flow so it's progressive.

32valvesftw · 12-31-2016

I thought Marc said that the Borla mufflers flow well its the resonator that is the choke point?

RussMcB · 12-31-2016

I really like my Borla system. Actually, mine is just the Borla mufflers. The rest is SW X-pipe, custom pipes and headers (no resonator). My car makes good power, but there are other changes, so it's hard to say how much the exhaust helps or hurts. There is some drone, but not too bad. I don't mind it but I'm careful with throttle and gears when my wife is in the car.

tf95ZR1 · 12-31-2016

Quote:

Originally Posted by RussMcB

I really like my Borla system. Actually, mine is just the Borla mufflers. The rest is SW X-pipe, custom pipes and headers (no resonator). My car makes good power, but there are other changes, so it's hard to say how much the exhaust helps or hurts. There is some drone, but not too bad. I don't mind it but I'm careful with throttle and gears when my wife is in the car.

I'm with Russ. I LOVE my system. I had the Borla exhaust. Had the car dynoed.
Lost the resonator, replaced with B&B X pipe. Re dyno: 25 more HP!
Headers (Bullet cats) love the sound. Yes drone @ 1800 rpm.
So, yes, the Borla resonator sucks. (IMHO)

RussMcB · 12-31-2016

I might add, I chose not to use cats, and sometimes I wonder if that was a mistake. I've had people tell me they smelled gas after following me.

I've read people say that can be tuned out, but my tuner said, not so easy to do.

tf95ZR1 · 12-31-2016

Quote:

Originally Posted by RussMcB

I might add, I chose not to use cats, and sometimes I wonder if that was a mistake. I've had people tell me they smelled gas after following me. I've read people say that can be tuned out, but my tuner said, not so easy to do.

Exactly! (again)
I had my muffler guy weld in flanges so I can change out between:
1) Straight pipe
2) Bullet cats
3) Humongo industrial cats

DD is #2 for smell reasons.
Mojave Mile/ Mojave Magnum #1
#3 to (try and) pass smog check.

I have a Kwik-Lift and have gotten pretty good at
changing them.

12-31-2016	#4
Top Toy Join Date: Jul 2012 Location: Allentown, PA Posts: 309	Re: 1991 Borla exhaust flow The new B&B Fusion dual mode exhaust system has the best combination of loud and quiet when open or closed with no resonance. And minimal back pressure when open. But their latest version uses round instead of oval cans which look a little odd on our cars. Corsa is single mode and loud at idle and WOT and fairly low back pressure because it's straight thru on one side but it's only 2 1/2" and the second outlet is completely blocked off. Sound is a bit raspy. Stainless Works has two different versions. The Turbo S is single mode and straight thru on one side like the Corsa but 3" inlet, 2 3/4" thru the tubes and fully open on both sides. One of the least restrictive mufflers for our cars. Deep rumble at idle and cruise. Very loud at WOT. Moderate resonance when lugging up hills. I have no experience with Stainless Works quiet system but assume it's more restrictive. Sent from my XT1254 using ZR-1 Net Registry mobile app __________________ '95 ZR-1, aqua/gray, #167 368 LPE/Haibeck, Web cams, Stainless Works headers, B&B Fusion exhaust, 18" Fikse wheels, Alcon brakes, lowered. 491 SAE RWHP.

12-31-2016	#5
XfireZ51 Join Date: May 2007 Location: Chicagoland, IL Posts: 9,711	Re: 1991 Borla exhaust flow Someone on the Forum has experience w the DynoMax system using an internal Flapper valve controlled by exhaust flow so it's progressive. __________________ [SIGPIC][/SIGPIC]Former Membership Chairman Former ZR-1 Registry - BOD 1972 Corvette 4speed base Coupe SOLD long time ago 1984 Corvette Z-51/4+3 SOLD 1992 Corvette ZR-1 Aqua/Gray #474 SOLD 1992 Corvette ZR-1 Black Rose/Cognac #458 2014 Honda VFR Interceptor DX

12-31-2016	#6
32valvesftw Join Date: Jun 2015 Location: Texas Posts: 530	Re: 1991 Borla exhaust flow I thought Marc said that the Borla mufflers flow well its the resonator that is the choke point?

12-31-2016	#7
RussMcB Join Date: Jan 2015 Location: Marietta, GA USA Posts: 1,160	Re: 1991 Borla exhaust flow I really like my Borla system. Actually, mine is just the Borla mufflers. The rest is SW X-pipe, custom pipes and headers (no resonator). My car makes good power, but there are other changes, so it's hard to say how much the exhaust helps or hurts. There is some drone, but not too bad. I don't mind it but I'm careful with throttle and gears when my wife is in the car. __________________ Russ McBride, [COLOR="Red"]Car Sold 8/2020[/COLOR] #1635, Marietta, GA USA, 1991 ZR-1, #766 (bought 1/1/2015) MS3-Pro, OBX, SW X-Pipe, Borla, Hurst, SLP, Goodyear F1 GS-D3, Kenwood. HOTB 2016Q3 [IMG]http://zr1.net/forum/picture.php?albumid=316&pictureid=2873[/IMG] [IMG]http://zr1.net/forum/picture.php?albumid=336&pictureid=2985[/IMG]

12-31-2016	#9
RussMcB Join Date: Jan 2015 Location: Marietta, GA USA Posts: 1,160	Re: 1991 Borla exhaust flow I might add, I chose not to use cats, and sometimes I wonder if that was a mistake. I've had people tell me they smelled gas after following me. I've read people say that can be tuned out, but my tuner said, not so easy to do.

12-30-2016	#1
1991KOTH Join Date: Nov 2016 Location: Florida Posts: 66	1991 Borla exhaust flow How well does the Borla exhaust flow? Really like how it looks but may end up buying corsa depending on flow. Buying SW headers for sure though. Sent from my iPhone using ZR-1 Net Registry

12-31-2016	#2
Kevin Join Date: Jun 2005 Location: pittsburgh Posts: 4,632	Re: 1991 Borla exhaust flow i think its worse then factory __________________ It's not the car, it's the people - Doug Johnson 90 r/r "KEYS ON" nick named "T.L.B"

12-31-2016	#3
HAWAIIZR-1 Join Date: May 2010 Location: Japan Posts: 3,606	Re: 1991 Borla exhaust flow Here is some information from the ZR-1 Specialist: http://www.zr1specialist.com/HAT%20W...%20Systems.pdf Sent from my iPhone using ZR-1 Net Registry __________________ Craig "ZR-1 NO KA 'OI" "ZR-1 ICHIBAN" 1995 #228 Black/Black with Dunn Heads ZR-1 owner since September 2003 ZR-1 Net Registry Founding Member #0074 NCM Lifetime Member #2048