05-08-2012 | #1 |
Join Date: Aug 2011
Location: Evergreen, Co.
Posts: 346
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Factory Exhaust Resonator Removal and Free Flowing Alternatives
How many of you have tried keeping your stock 2.75" factory ZR1 exhaust system and just replacing the 1990-92 restrictive resonator with an aftermarket freer flowing resonator or x pipe?
Haibeck says the stock resonator is a major exhaust flow restriction costing about 20hp, due to the resonator core reducing to 1 5/8” ID. What is the best product to replace the resonator with to maintain the low noise and no resonance I currently enjoy? I prefer not to go to a straight pipe or crossover, but rather find a replacement resonator with straight through 2.5-3" pipes. Has anyone tried the DynoMax® Ultra Flo™ X performance stainless steel mufflers with 3-in. diameter internal X-pipe balance tubes? I am concerned about fitment issues, so what have you tried that fits the factory pipes and doesn't drone? |
05-08-2012 | #2 | |
Join Date: May 2007
Location: Peoria, AZ
Posts: 9,155
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Re: Factory Exhaust Resonator Removal and Free Flowing Alternatives
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GOLDCYLON - 91 ZR-1 #2014 GOLDCYLON - 90 ZR-1 #2794, 4L60e (Formerly Schrade's) GOLDCYLON - 11 CTS-V Arizona State Director 91 WHITE/BLACK #2014. 380 P&P&PCed,Ported Heads, Jeal Long tubes, Corsa Exhaust/FIKSE FM-5s /LED TLs, LED Headlights, Front Wilwood 6 piston narrowlite calipers and rear Wilwood caliper street shop mod,CNCed Coolant Pipes,TPI Cvr,Filter cover,Stainless Bolts, DRM/DOM PROM /ZFDOC mod build #102,DRLs,BMAD with stainless Debris Screen,Coplan Air Blaster, Pioneer APP Radio 4,Brey-Krause HB,Sub Bar,Fire extinguisher seat mount,DRM Coilovers,LEDs everywhere,Compass mirror (orange),V1 DIC hidden display, Homelink sun visor, Carbon Fiber top x3 and APSIS Carbon Fiber interior, APSIS CF Steering Wheel/NAPA Leather, Banski trailing arms, Guldstrand front suspension,urethane bushings from Prothane (total suspension) ZFDoc drive shaft safety loop, raptor shift light (orange),AO engineering louver front plate, Console seat cushion, 96CE seats with black custom Sheepskins, ss billet catch can,Viper remote entry/alarm,Cragar Rear Louvers,LED side louver lights, Dewitts Radiator with SPAL fans and a Woods 160 T-Stat 90 RED/BLACK #2794. 4L60e Automatic Stage V by RPM Transmission, TCI Dedicated TCM, OBX Stainless Headers, Corsa Exhaust, SAN Secondaries and Haibeck PROM, Exotic Muscle Coil overs, LED Interior Lights, LED Tail Lights, LED Headlights, 94 Sport seats with black custom Sheepskins , Cragar rear louvers, GS Front calipers, Banski Trailing arms, APSIS Carbon Fiber steering wheel, Front and Rear Baer Eradispeeds, DRLs, Guldstrand front suspension,urethane bushings from Prothane (total suspension), Dewitt's Raditor with Dual SPAL fans and a Haibeck 170 T-Stat 11 RED/GREY CTS-V |
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05-08-2012 | #3 |
Join Date: May 2005
Location: Georgia Mountains
Posts: 927
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Re: Factory Exhaust Resonator Removal and Free Flowing Alternatives
AFAIK there are only 2 systems that have NO drone ... stock and Corsa ... the fitment is fine on either system. Corsa is reasonably tame until you get above 2500-2800 rpm then it is very loud (at least to me).
The early (90-92) stock systems were not only restrictive at the resonator but also at the mufflers ... can't remember the neck down at the muffs but I believe it was about 2" or less. Also, I think that only one tip flowed; the other was for appearance. The later stock systems were less restrictive and if you want to stay with a stock system it's probably easier to get one than try to mod or adapt an early model to fit your needs; otherwise you're looking at a variety of 3rd party exhaust systems. Finding the "perfect" exhaust system for all situations is a tough, perhaps impossible task ... I know since I currently have 3 systems hanging on the garage wall plus a Corsa system currently installed. Every system I have (except for the stock 90) has a certain appeal to me but also some drawbacks ... I'm looking for the happy medium which may not exist. Do a search on this forum ... the guys in Chicago are doing some really nice things with larger systems, C6 flapper mufflers, etc. I haven't heard any of these systems yet but plan to next week at BG ... great place to hear a lot of different exhaust systems. George |
05-08-2012 | #4 |
Join Date: Nov 2011
Location: Dunbarton NH
Posts: 7,486
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Re: Factory Exhaust Resonator Removal and Free Flowing Alternatives
I'm running a brand new OBX system, headers and exhaust. No drone. If you're coming to BG, you are welcome to come for a ride with me and listen. Maybe you can drive, maybe.
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05-08-2012 | #5 |
Join Date: Aug 2011
Location: Evergreen, Co.
Posts: 346
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Re: Factory Exhaust Resonator Removal and Free Flowing Alternatives
Thanks for all the feedback guys. I would love to hear the new OBX system... But I really had my heart set on finding a replacement resonator for the stock 1991 exhaust. The 1991 mufflers according to Chevy are 40% larger than the 1990's and have much less backpressure, plus I like em quiet.
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Bert Rankin 1991 ZR1 Steel Blue / Steel Blue #1029 Haibeck chip, slotted rotors, camber brace, C-beam plates, OBX exhaust, Nitto NT555 tires [SIGPIC][/SIGPIC] |
05-08-2012 | #6 | |
Join Date: May 2007
Location: Peoria, AZ
Posts: 9,155
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Re: Factory Exhaust Resonator Removal and Free Flowing Alternatives
Quote:
I have a corsa resonator in my attic. If you want to get it fit at a shop to try it out. I paid $200 for it I would let it go at that plus shipping.
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GOLDCYLON - 91 ZR-1 #2014 GOLDCYLON - 90 ZR-1 #2794, 4L60e (Formerly Schrade's) GOLDCYLON - 11 CTS-V Arizona State Director 91 WHITE/BLACK #2014. 380 P&P&PCed,Ported Heads, Jeal Long tubes, Corsa Exhaust/FIKSE FM-5s /LED TLs, LED Headlights, Front Wilwood 6 piston narrowlite calipers and rear Wilwood caliper street shop mod,CNCed Coolant Pipes,TPI Cvr,Filter cover,Stainless Bolts, DRM/DOM PROM /ZFDOC mod build #102,DRLs,BMAD with stainless Debris Screen,Coplan Air Blaster, Pioneer APP Radio 4,Brey-Krause HB,Sub Bar,Fire extinguisher seat mount,DRM Coilovers,LEDs everywhere,Compass mirror (orange),V1 DIC hidden display, Homelink sun visor, Carbon Fiber top x3 and APSIS Carbon Fiber interior, APSIS CF Steering Wheel/NAPA Leather, Banski trailing arms, Guldstrand front suspension,urethane bushings from Prothane (total suspension) ZFDoc drive shaft safety loop, raptor shift light (orange),AO engineering louver front plate, Console seat cushion, 96CE seats with black custom Sheepskins, ss billet catch can,Viper remote entry/alarm,Cragar Rear Louvers,LED side louver lights, Dewitts Radiator with SPAL fans and a Woods 160 T-Stat 90 RED/BLACK #2794. 4L60e Automatic Stage V by RPM Transmission, TCI Dedicated TCM, OBX Stainless Headers, Corsa Exhaust, SAN Secondaries and Haibeck PROM, Exotic Muscle Coil overs, LED Interior Lights, LED Tail Lights, LED Headlights, 94 Sport seats with black custom Sheepskins , Cragar rear louvers, GS Front calipers, Banski Trailing arms, APSIS Carbon Fiber steering wheel, Front and Rear Baer Eradispeeds, DRLs, Guldstrand front suspension,urethane bushings from Prothane (total suspension), Dewitt's Raditor with Dual SPAL fans and a Haibeck 170 T-Stat 11 RED/GREY CTS-V |
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05-08-2012 | #7 | |
Join Date: Feb 2011
Location: San Marcos CA
Posts: 1,802
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Re: Factory Exhaust Resonator Removal and Free Flowing Alternatives
Quote:
I would easily say that my stock 90 pipes and mufflers with the magnaflow x-pipe are quieter than Corsa at pretty much every power level. I used the magnaflow x-pipe from their x-pipe and resonator combo- just hacked off the chrome resonator can due to ground clearance concerns. |
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05-08-2012 | #8 |
Join Date: Feb 2011
Location: San Marcos CA
Posts: 1,802
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Re: Factory Exhaust Resonator Removal and Free Flowing Alternatives
I bought this from Hans when I got the stock exhaust, but ended up only using the x-pipe. You could just have your exhaust guy make one, but you could also buy this pipe for $85 from Summit.
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05-08-2012 | #9 | |
Join Date: May 2007
Location: Peoria, AZ
Posts: 9,155
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Re: Factory Exhaust Resonator Removal and Free Flowing Alternatives
Quote:
__________________
GOLDCYLON - 91 ZR-1 #2014 GOLDCYLON - 90 ZR-1 #2794, 4L60e (Formerly Schrade's) GOLDCYLON - 11 CTS-V Arizona State Director 91 WHITE/BLACK #2014. 380 P&P&PCed,Ported Heads, Jeal Long tubes, Corsa Exhaust/FIKSE FM-5s /LED TLs, LED Headlights, Front Wilwood 6 piston narrowlite calipers and rear Wilwood caliper street shop mod,CNCed Coolant Pipes,TPI Cvr,Filter cover,Stainless Bolts, DRM/DOM PROM /ZFDOC mod build #102,DRLs,BMAD with stainless Debris Screen,Coplan Air Blaster, Pioneer APP Radio 4,Brey-Krause HB,Sub Bar,Fire extinguisher seat mount,DRM Coilovers,LEDs everywhere,Compass mirror (orange),V1 DIC hidden display, Homelink sun visor, Carbon Fiber top x3 and APSIS Carbon Fiber interior, APSIS CF Steering Wheel/NAPA Leather, Banski trailing arms, Guldstrand front suspension,urethane bushings from Prothane (total suspension) ZFDoc drive shaft safety loop, raptor shift light (orange),AO engineering louver front plate, Console seat cushion, 96CE seats with black custom Sheepskins, ss billet catch can,Viper remote entry/alarm,Cragar Rear Louvers,LED side louver lights, Dewitts Radiator with SPAL fans and a Woods 160 T-Stat 90 RED/BLACK #2794. 4L60e Automatic Stage V by RPM Transmission, TCI Dedicated TCM, OBX Stainless Headers, Corsa Exhaust, SAN Secondaries and Haibeck PROM, Exotic Muscle Coil overs, LED Interior Lights, LED Tail Lights, LED Headlights, 94 Sport seats with black custom Sheepskins , Cragar rear louvers, GS Front calipers, Banski Trailing arms, APSIS Carbon Fiber steering wheel, Front and Rear Baer Eradispeeds, DRLs, Guldstrand front suspension,urethane bushings from Prothane (total suspension), Dewitt's Raditor with Dual SPAL fans and a Haibeck 170 T-Stat 11 RED/GREY CTS-V |
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05-08-2012 | #10 |
Join Date: Jun 2010
Location: back in lone pine
Posts: 591
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Re: Factory Exhaust Resonator Removal and Free Flowing Alternatives
you could also buy a 3in xpipe from summit about 80 bucks . then buy 2 dyno max super turbo mufflers 3in inlet and dual 21/2 in outlets about 150 for both hack off the zr1 tips from the stk exhaust and have a nice no drone exhaust for about 350 and it would look stk . idf you pm me your email i will send you a utube video of my car going down the drag strip with this exhaust on my 92 .
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