View Poll Results: what size pipe for true duals
2.50''
30
50.00%
2.75''
3
5.00%
3.00''
26
43.33%
3.25''
1
1.67%
Voters: 60. You may not vote on this poll
what size pipe for true duals?
11-30-2007, 09:59 AM
#1
what size pipe for true duals? im using hooker shorty headers and a true dual system w/ an H pipe. Just wondering what size pipe is best for power.
just a note, im not looking for ANY power at the high end (max speed)lol i need everything at the low end(take off)
just a note, im not looking for ANY power at the high end (max speed)lol i need everything at the low end(take off)
11-30-2007, 10:22 AM
#4
Tech Resident
2.5" for sure. There's no need for 3" TD's. All it's going to do is sacrifice ground clearance with no additional gains. If anything, the 2.5" will make things feel more torquey. 99% of the people on this site will never need 3" TD's. They'll only hurt you.
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11-30-2007, 02:04 PM
#8
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3" for sure, it's not going to hurt anything now and you'll have room to make more power with it. And for the record, I had 3" duals with Magnaflow 4x9s on my SS which is lowered on a pro-kit and ground clearance wasn't an issue, at least not any more so than when I had my TSP off road y with a Borla catback exhaust.
11-30-2007, 09:40 PM
#11
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CI= Cubic Inches. THe bigger the motor the more air it will move.
CC did an article a few years ago testing 2.5", 3.0" and 3.5" dual exhausts for power ant tourque on a 396 70 Chevelle. While the 3" was the best choice for a strip car with limited street and the 3.5" was best for a strip only car. The 2.5" was best overall for a street driven vehicle. At lower RPMs tourque was up everywhere over the two larger diameter exhaust systems. 80% of us are doing just fine with the stock style single 3".
I stated this in another exhaust thread you started. Since it's a Jeep and you desire tourque over top end HP, I would go with a 2.5" Y into a single 3" system. While not as flashy as duals, it will fit easier under your jeep, give you better low end and overall good perfoamance.
Re'
CC did an article a few years ago testing 2.5", 3.0" and 3.5" dual exhausts for power ant tourque on a 396 70 Chevelle. While the 3" was the best choice for a strip car with limited street and the 3.5" was best for a strip only car. The 2.5" was best overall for a street driven vehicle. At lower RPMs tourque was up everywhere over the two larger diameter exhaust systems. 80% of us are doing just fine with the stock style single 3".
I stated this in another exhaust thread you started. Since it's a Jeep and you desire tourque over top end HP, I would go with a 2.5" Y into a single 3" system. While not as flashy as duals, it will fit easier under your jeep, give you better low end and overall good perfoamance.
Re'
11-30-2007, 10:03 PM
#12
CI= Cubic Inches. THe bigger the motor the more air it will move.
CC did an article a few years ago testing 2.5", 3.0" and 3.5" dual exhausts for power ant tourque on a 396 70 Chevelle. While the 3" was the best choice for a strip car with limited street and the 3.5" was best for a strip only car. The 2.5" was best overall for a street driven vehicle. At lower RPMs tourque was up everywhere over the two larger diameter exhaust systems. 80% of us are doing just fine with the stock style single 3".
I stated this in another exhaust thread you started. Since it's a Jeep and you desire tourque over top end HP, I would go with a 2.5" Y into a single 3" system. While not as flashy as duals, it will fit easier under your jeep, give you better low end and overall good perfoamance.
Re'
CC did an article a few years ago testing 2.5", 3.0" and 3.5" dual exhausts for power ant tourque on a 396 70 Chevelle. While the 3" was the best choice for a strip car with limited street and the 3.5" was best for a strip only car. The 2.5" was best overall for a street driven vehicle. At lower RPMs tourque was up everywhere over the two larger diameter exhaust systems. 80% of us are doing just fine with the stock style single 3".
I stated this in another exhaust thread you started. Since it's a Jeep and you desire tourque over top end HP, I would go with a 2.5" Y into a single 3" system. While not as flashy as duals, it will fit easier under your jeep, give you better low end and overall good perfoamance.
Re'
yea i would go with that set up but i cant use a Y-pipe because it hangs down and prevents the front driveshaft from going on. i have to do a true dual set up because i dont have to worry about wrapping the drivers side exhaust under the bellhousing to the other side- i can just have it go straight back going over the front drive shaft yoke on the transfer case
soo 2.5'' is winning the poll now.. hmm
i found a home made x pipe in my garage that MIGHT fit under my jeep, its for a 3'' system
Last edited by TXjeepTJ; 11-30-2007 at 10:44 PM.
12-01-2007, 07:45 PM
#16
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2-1/2" is all that's needed for 346ci. From all I have ever read here, it seems a 3" Y-Pipe is equal to 2-1/2" duals in flow.....I know 3" would be bigger..but is it better unless you have more cubey's.
12-02-2007, 11:58 AM
#20
Tech Resident
Even so, the TSP kit should outperform any y-pipe setup. I'm just not a fan of the TSP TD system. I don't want 3", I don't like X-pipes, I don't like dumps and I want single chambers and they don't offer them
