are true duals possible?
04-19-2014, 02:20 PM
#1
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Car: 1989 pontiac firebird formula
Engine: 5.7 350 tpi
Transmission: 700r4 i think
are true duals possible?
I was looking into true duals for my 89 formula 350 and was told it isn't even worth bothering with. I have stock dual cats so I figured it would be relatively easy but apparently not. is this true of one guys false opinion? also I was looking into electronic dumps and was wondering on a y pipe vs. duals and with the eds how much power loss/gain am I looking at. thanks yall
04-19-2014, 02:53 PM
#2
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Re: are true duals possible?
true duals are definetly possible.
do you have headers? if not, i'd do them at the same time.
running dual exhaust is heavier, costs more, and is more fabrication.
if you want to add a cut-out, think how much more duals will cost,...2 mufflers, 2 cut-outs, 2 y-pipes for the cut-outs, more pipe, hangers, etc.
i have dual 2 1/2" exhaust on my car, but i wish i would have done some homework here before i made it.
i think single 3 1/2" pipe flows about the same cfm as dual 2 1/2"?
IMO, duals dont sound any better or different.
HP gain? idk, but you should feel it a little bit if done right. i saw a response to a similar question to yours in another thread and the guy said something like, it's not just the performance of adding headers, it's a mod that will further enhance other mods down the road.
do you have headers? if not, i'd do them at the same time.
running dual exhaust is heavier, costs more, and is more fabrication.
if you want to add a cut-out, think how much more duals will cost,...2 mufflers, 2 cut-outs, 2 y-pipes for the cut-outs, more pipe, hangers, etc.
i have dual 2 1/2" exhaust on my car, but i wish i would have done some homework here before i made it.
i think single 3 1/2" pipe flows about the same cfm as dual 2 1/2"?
IMO, duals dont sound any better or different.
HP gain? idk, but you should feel it a little bit if done right. i saw a response to a similar question to yours in another thread and the guy said something like, it's not just the performance of adding headers, it's a mod that will further enhance other mods down the road.
04-19-2014, 03:01 PM
#3
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Car: 1989 pontiac firebird formula
Engine: 5.7 350 tpi
Transmission: 700r4 i think
Re: are true duals possible?
true duals are definetly possible.
do you have headers? if not, i'd do them at the same time.
running dual exhaust is heavier, costs more, and is more fabrication.
if you want to add a cut-out, think how much more duals will cost,...2 mufflers, 2 cut-outs, 2 y-pipes for the cut-outs, more pipe, hangers, etc.
i have dual 2 1/2" exhaust on my car, but i wish i would have done some homework here before i made it.
i think single 3 1/2" pipe flows about the same cfm as dual 2 1/2"?
IMO, duals dont sound any better or different.
HP gain? idk, but you should feel it a little bit if done right. i saw a response to a similar question to yours in another thread and the guy said something like, it's not just the performance of adding headers, it's a mod that will further enhance other mods down the road.
do you have headers? if not, i'd do them at the same time.
running dual exhaust is heavier, costs more, and is more fabrication.
if you want to add a cut-out, think how much more duals will cost,...2 mufflers, 2 cut-outs, 2 y-pipes for the cut-outs, more pipe, hangers, etc.
i have dual 2 1/2" exhaust on my car, but i wish i would have done some homework here before i made it.
i think single 3 1/2" pipe flows about the same cfm as dual 2 1/2"?
IMO, duals dont sound any better or different.
HP gain? idk, but you should feel it a little bit if done right. i saw a response to a similar question to yours in another thread and the guy said something like, it's not just the performance of adding headers, it's a mod that will further enhance other mods down the road.
04-19-2014, 03:39 PM
#4
Supreme Member
Re: are true duals possible?
do you have to pass any emissions tests where you live with the car?
if you can weld and fabricate, that will save money on the exhaust. a good exhaust will compliment other mods, like you listed, and help get the most out of them.
if you can weld and fabricate, that will save money on the exhaust. a good exhaust will compliment other mods, like you listed, and help get the most out of them.
04-19-2014, 03:43 PM
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Car: 1989 pontiac firebird formula
Engine: 5.7 350 tpi
Transmission: 700r4 i think
Re: are true duals possible?
not sure actually about the emissions, where I currently live no but im moving back to texas so I should look that up
04-19-2014, 03:53 PM
#6
Supreme Member
Re: are true duals possible?
maybe somebody from texas will let ya know what the laws are like?
it didnt look good from this; http://www.txdps.state.tx.us/rsd/vi/...aq/faq_asm.htm
it didnt look good from this; http://www.txdps.state.tx.us/rsd/vi/...aq/faq_asm.htm
04-19-2014, 04:06 PM
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Car: 1989 pontiac firebird formula
Engine: 5.7 350 tpi
Transmission: 700r4 i think
Re: are true duals possible?
maybe somebody from texas will let ya know what the laws are like?
it didnt look good from this; http://www.txdps.state.tx.us/rsd/vi/...aq/faq_asm.htm
it didnt look good from this; http://www.txdps.state.tx.us/rsd/vi/...aq/faq_asm.htm
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05-09-2014, 10:13 AM
#8
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Car: 87 Iroc-Z
Engine: 305 tpi
Transmission: 700-r4
Axle/Gears: 3.42
Re: are true duals possible?
The only thing I've ever seen come up is if you have dumps they need to be aimed down or to the side but he didn't say nothin about no cat
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