REAL difference in power between these two exhaust setups...
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Ok, well I'm still having trouble making up my mind, so lets go back to the original question.
What would the REAL power/torque difference be between a custom made 3" ORY with a Flowmaster merge into a Hooker catback and true duals be?
I just want to know what gains I will see in hp/tq/times and then I will try to make up my mind if it's worth the extra $500+ it's going to cost me.
Thanks
What would the REAL power/torque difference be between a custom made 3" ORY with a Flowmaster merge into a Hooker catback and true duals be?
I just want to know what gains I will see in hp/tq/times and then I will try to make up my mind if it's worth the extra $500+ it's going to cost me.
Thanks
Duals with xpipe crossover will always make more tq than a ypipe. It's simple physics. Ypipe does not scavenge hardly, if at all.
I gained 20 lb/ft in the midrange going to duals. Yes I swapped converters also, but gained nothing on top end, where converters help, so I don't count that in the gain.
Duals sound much better, and if they are built right, fit just fine. But for you, on a budget, a new ypipe is a mightly attractive offer.
I gained 20 lb/ft in the midrange going to duals. Yes I swapped converters also, but gained nothing on top end, where converters help, so I don't count that in the gain.
Duals sound much better, and if they are built right, fit just fine. But for you, on a budget, a new ypipe is a mightly attractive offer.
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Yes it is... and that is why I'm having such a hard time with this. So far it's all been easy choices for price/performance (like pacesetters, used ls6, etc.), but this is bothering me. Nobody seems to know a definite answer, and I get a lot of people just telling me things that they have heard someone else say, so they tell me, and I know they don't really know themselves. So its making this one a hard decision since it isn't an obvious best choice like the rest of it has been...
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Ok, well let me ask this then. Would I see any gains in the 1/4? Or is it mostly midrage tq (which still won't really help... I need midrange as much as anything since i'm on the street 99% of the time, lol)?
gains in the 1/4 will be very small, once again too small to justify 500$. I would go duals because of the sound and the scavenging, I have duals out the back and is the best sounding exhaust I have heard IMO. I would never go back to a Y-pipe.
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Yeah. I really wish I knew what the duals I would be getting like would actually sound like... Then I could get a better idea of what I wanted to do.
Basically my two options for this spring are:
1. Do the true duals and have to wait for the torque converter till this fall.
2. Just get the custom y with the flowmaster merge and have enough to get the converter now too. Then wait till the fall for the tires.
Basically my two options for this spring are:
1. Do the true duals and have to wait for the torque converter till this fall.
2. Just get the custom y with the flowmaster merge and have enough to get the converter now too. Then wait till the fall for the tires.
I changed my old dumped duals for an out the back setup last week. It cost me 500$ for a whole new exhaust system from the header flange to the rear tips. I provided them the bullets though. Go to exhaust shops and you can probably find one that will do the duals for a good price. that way you can get them and your converter. 
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From: Lafayette/West Lafayette, IN
Well, I have about $1000 now, plus the $350 or so I could get from my ORY/Hooker.
So thats $1350. Then we'll say the convter will probably be about $800 with fluids to be safe ($725+fluids).
That means I have about $550 to spend on the duals... That won't work. So really until this summer when I can earn some more money I can't get both the duals and the converter.
The thing I'm worried about with not getting duals is that I still wont like it (still have rasp) and I'll want duals anyway.
The thing I'm worried about with getting duals is that it will be too loud, whether that is before I get the converter, or when it gets louder after I get it. The extra money doesn't help any either.
So thats $1350. Then we'll say the convter will probably be about $800 with fluids to be safe ($725+fluids).
That means I have about $550 to spend on the duals... That won't work. So really until this summer when I can earn some more money I can't get both the duals and the converter.
The thing I'm worried about with not getting duals is that I still wont like it (still have rasp) and I'll want duals anyway.
The thing I'm worried about with getting duals is that it will be too loud, whether that is before I get the converter, or when it gets louder after I get it. The extra money doesn't help any either.
its a tough decision i know. i already have my aftermarket exhaust installed and now like you, i am thinking about duels. but if i did that i would have spent way to much for my exhaust system when you look at the big pic. also the gains would definatly not outweigh the $. so wouldnt it be sooooo much more useful to put that money into a cam and see some REAL gains? thats what i'm thinking myself.
Duals arent too loud if you go out the back with them. Mine are very tame even with the cam yet scream one you push the pedal down halfway. They will be lous if you dump them, if you go out the back they sound perfect.
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Well I am signed up now to get them put on on Monday . I'm getting 2.5" pipes into an X, into the flowmaster 1-chamber 10 series mufflers, over the axle and out the back. No tips yet, but that will come later. It's going to be just under $700 total he said, so I'm happy .
. I'm getting 2.5" pipes into an X, into the flowmaster 1-chamber 10 series mufflers, over the axle and out the back. No tips yet, but that will come later. It's going to be just under $700 total he said, so I'm happy . 
alright then post pics. are you goin to be there when he's making the exh? pics form under the car while in the air are the easiest to see how he does it. good luck and I cant wait to see pics and hear a sound clip.
Here is my test.
Car a:
1998 Silver Trans Am A4
90,768 miles
SLP Lid
Pacesetter Headers
Tires-Stock replacments with 9000 miles on them
TSP rumbler catback
Tune
Made-331/345
Car b:
1998 Silver Trans Am A4
88,371 miles
Slp Lid
Pacesetter Headers
Tires-Stock replacments with 5000 miles on them
TSP Rumbler Catback
Tune
Made 335/346
On the same day we ran off the line 3 times, and from a roll(30-120) 3 times. All 6 races were whoever hot the gas first had a fender lead and held it.
That same day, I(car a) went and got the TSP True Dual Rumbler exhaust put on.
We redid the same 6 runs with me pulling on car B even if he hit it first. Off the line and from a roll i put his nose at my rear and kept pulling slowly away, whereas we were neck and neck before. Car B got the TSP true dauls 2 weeks after and once again we redid the same 6 runs and were neck and neck again. This is my brother and I and we have the identical same car. So yes, the True duals gave me enough power to put me about a car length ahead at about 120 from a 30 roll. Off the line it put me about the same till 80. Not to mention they sound great.
Car a:
1998 Silver Trans Am A4
90,768 miles
SLP Lid
Pacesetter Headers
Tires-Stock replacments with 9000 miles on them
TSP rumbler catback
Tune
Made-331/345
Car b:
1998 Silver Trans Am A4
88,371 miles
Slp Lid
Pacesetter Headers
Tires-Stock replacments with 5000 miles on them
TSP Rumbler Catback
Tune
Made 335/346
On the same day we ran off the line 3 times, and from a roll(30-120) 3 times. All 6 races were whoever hot the gas first had a fender lead and held it.
That same day, I(car a) went and got the TSP True Dual Rumbler exhaust put on.
We redid the same 6 runs with me pulling on car B even if he hit it first. Off the line and from a roll i put his nose at my rear and kept pulling slowly away, whereas we were neck and neck before. Car B got the TSP true dauls 2 weeks after and once again we redid the same 6 runs and were neck and neck again. This is my brother and I and we have the identical same car. So yes, the True duals gave me enough power to put me about a car length ahead at about 120 from a 30 roll. Off the line it put me about the same till 80. Not to mention they sound great.
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Thats cool. Thanks. Thats exactly what I was looking for. Do you guys have any dyno numbers now that you have the duals on them? Either car would be fine, I'm just curious what kind of gains you guys got.
I went from ORY and loudmouth to 2.5 duals over the axle with 1 chamber flows and picked up .2 in the 1/4 with no other changes. Same track, pretty much the same DA and everything. it was 100% in the exhaust change. I am bolt-on and cammed though so it probably helped more than it would on a near-stock car. I'm a stalled auto on DRs, my car is very consistent.