what diameter for exhaust?
01-09-2007, 02:31 PM
#1
what diameter for exhaust?
i have a 95 maxima and im looking into a custom exhaust. i want a catback without a resonator and a cheap ebay muffler. my question is what diameter piping should i get? 2.25 or 2.5? any suggestion would be greatly appreciated
thnx
thnx
01-09-2007, 02:36 PM
#2
I think 2.25 is stock diameter(maybe 2.0 though?) I would suggest 2.5, thats the size I got and it can be pretty quiet with the right muffler or very obnoxious with a yosuckamo. I'd get it from somewhere that sells it for our car though, I went to meinekee and they didn't do good at all on a custom cat back.
01-09-2007, 04:54 PM
#4
Stock is about 2", but has major crimps in the pipes. Go with 2.25 or 2.5 mandrel bent pipes and youll be fine. If you dont have a Y pipe it will sound pretty good, other wise watch out for the huge increase in sound.
01-09-2007, 04:56 PM
#5
Originally Posted by Wikipedia
Backpressure usually refers to the pressure exerted on a moving fluid by obstructions or tight bends in the confinement vessel along which it is moving, such as piping or air vents, against its direction of flow. For example, an automotive exhaust muffler with a particularly high number of twists, bends, turns and right angles could be described as having particularly high backpressure [1]. Back Pressure in the exhaust sense of the term, is usually termed as being a "bad thing" for performance, however in the ever increasing vigilance of the law, back pressure can be regulated to keep exhaust noise down using systems from simple butterfly valves to fully computer controlled units sensing pressure in the exhaust pipe itself.
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01-09-2007, 07:15 PM
#6
its not about back pressure......its about sustaining enough heat in the exhaust piping to create enough velocity for it to exit as fast as possible...too big will cause too much heat loss and slowing down the velocity...to little causes back pressure and it cant breathe.....2.25 or 2.5
01-09-2007, 07:19 PM
#7
let me tell you wats best, i have seen and heard both of them. 2.25 catback makes the car loud as hell with any headers... best suggestion is a 2.5 with a 4" exhaust i think thats the cleanest more sporty sound you will hear trust me on this, wont be too loud or too quiet
01-09-2007, 08:03 PM
#11
Originally Posted by Apparition
The best of all worlds would be 2.25.. I have 2.5 near all the way and I think that's a little too open for the VQ30. It seems pretty sluggish until I hit 3k, then it fawkin screams.
01-09-2007, 08:08 PM
#13
Originally Posted by Grand_hustle17
let me tell you wats best, i have seen and heard both of them. 2.25 catback makes the car loud as hell with any headers... best suggestion is a 2.5 with a 4" exhaust i think thats the cleanest more sporty sound you will hear trust me on this, wont be too loud or too quiet
what? the muffler you have is a huge part of it. an open flow 4" rice can is gonna be obnoxious. but a flowmaster or other with well placed baffles and is actually tuned would be a better choice.
01-09-2007, 08:14 PM
#15
i personally got a warpspeed 2.5in y, magnaflow cat also 2.5 and a maganflow muffler also 2.5in. very clean and deep. not loud at all. especially while cruising, its real deep below 3 then it opens up. i hate the wide open sound when i hit close to 5000 or 5500 then it sounds like the muffler doesn't have enough air coming out. looks like the mevi will have to go back in. hehehe.
got many compliments on the clean deep note.
got many compliments on the clean deep note.
01-09-2007, 08:15 PM
#16
Originally Posted by 86maxima96
what? the muffler you have is a huge part of it. an open flow 4" rice can is gonna be obnoxious. but a flowmaster or other with well placed baffles and is actually tuned would be a better choice.
01-09-2007, 08:32 PM
#17
Originally Posted by 86maxima96
what? the muffler you have is a huge part of it. an open flow 4" rice can is gonna be obnoxious. but a flowmaster or other with well placed baffles and is actually tuned would be a better choice.
another great way to prove my point... Greddy, which makes just about the best exhaust system for maxima's, what do you think they use?... so your research, 2.5 catback with 4" tip, so if you want, dont even take my word for it, how about calling greddy and ask them?
01-09-2007, 08:53 PM
#19
Originally Posted by Grand_hustle17
another great way to prove my point... Greddy, which makes just about the best exhaust system for maxima's, what do you think they use?... so your research, 2.5 catback with 4" tip, so if you want, dont even take my word for it, how about calling greddy and ask them?
Cattman makes the best products for our cars hands down, at least IMO.. I also would love to see proof that 2.5> 2.25, keep in mind I HAVE 2.5. No conflict of interest there.. My low end TQ suffered after the 2.5 all the way back, the mids and top end gained an amazing amount that's all I'm getting at.
01-09-2007, 09:01 PM
#20
read what i said greddy makes just about the best, i agree about catman performance, but also stillen also makes 2.5 pipes, catman also makes 4" tips... i dont disagree with a 2.25 catback but if your going to do headers then 2.25 is not as good im telling you for a fact...
01-09-2007, 09:02 PM
#22
Originally Posted by Grand_hustle17
read what i said greddy makes just about the best, i agree about catman performance, but also stillen also makes 2.5 pipes, catman also makes 4" tips... i dont disagree with a 2.25 catback but if your going to do headers then 2.25 is not as good im telling you for a fact...
01-09-2007, 09:09 PM
#24
Originally Posted by Apparition
Are you fawkin stupid? Greddy is not the best. Do I have facts to back that up?.. No.. Why?.. Because, Cattman only does R&D on maximas and a ton of it at that, look at the CP headers. Need I say more.. Now when it comes to catback it's to be debated as far as performance, but at that point it's mostly just sound and I gotta tell ya I've hear the SP2 along-side Cattman and the Cattman's design really shines.
Cattman makes the best products for our cars hands down, at least IMO.. I also would love to see proof that 2.5> 2.25, keep in mind I HAVE 2.5. No conflict of interest there.. My low end TQ suffered after the 2.5 all the way back, the mids and top end gained an amazing amount that's all I'm getting at.
Cattman makes the best products for our cars hands down, at least IMO.. I also would love to see proof that 2.5> 2.25, keep in mind I HAVE 2.5. No conflict of interest there.. My low end TQ suffered after the 2.5 all the way back, the mids and top end gained an amazing amount that's all I'm getting at.
01-09-2007, 09:25 PM
#28
proof of 2.5>2.25-
95 maxima (fully Equiped) vs 98 maxima (center of gravity)
95-intake, 2.5 catback, 4" exhaust, high flow cat
98-intake, 2.25 catback, 2.5" exhaust, high flow cat, y-pipe (dont remember which one)
winner= 95 maxima by 1 1/8 car.............. proven in >4 big racing nights, and every friday and saturday in Walker Mill Maryland, if anyone here is from MD that comes out any friday or saturday knows about a gold maxima on 18" silver and white maxima on 18" alloys, and if your on here and reads this i will prove it this saturday AGAIN so you can be a witness
95 maxima (fully Equiped) vs 98 maxima (center of gravity)
95-intake, 2.5 catback, 4" exhaust, high flow cat
98-intake, 2.25 catback, 2.5" exhaust, high flow cat, y-pipe (dont remember which one)
winner= 95 maxima by 1 1/8 car.............. proven in >4 big racing nights, and every friday and saturday in Walker Mill Maryland, if anyone here is from MD that comes out any friday or saturday knows about a gold maxima on 18" silver and white maxima on 18" alloys, and if your on here and reads this i will prove it this saturday AGAIN so you can be a witness
01-09-2007, 10:35 PM
#31
Actually, I just installed Budget B w/resonator and 5gth gen muffler, I could notice some improvement under 3k these days. Before, just with the Budget Y-pipe, anything under 3k is slightly worse than stock....you know, pick up wise. The sweet spot is still 3-5.5k though, but I am just saying that with the B-pipe and 5th muffler, I could feel noticeable difference under 3k under mid/partial-acceleration (not WOT).
However, since I don't have any dyno sheet......take this with YOUR OWN grain of salt.
However, since I don't have any dyno sheet......take this with YOUR OWN grain of salt.
01-10-2007, 06:52 AM
#33
Originally Posted by 86maxima96
what does a 3 inch long, 4 inch diameter tip at the end of 10 feet of 2.5" piping matter? if it was 2.5" tip it would be the exact same.
This thread is worthless with a dynosheet.
01-10-2007, 06:57 AM
#35
Originally Posted by f550maranello2
put ur stock y pipe back on and ull gain that lost bottom end torque....
Originally Posted by NmexMAX
This thread is worthless with a dynosheet.
01-10-2007, 07:14 AM
#36
Originally Posted by Grand_hustle17
proof of 2.5>2.25-
95 maxima (fully Equiped) vs 98 maxima (center of gravity)
95-intake, 2.5 catback, 4" exhaust, high flow cat
98-intake, 2.25 catback, 2.5" exhaust, high flow cat, y-pipe (dont remember which one)
winner= 95 maxima by 1 1/8 car.............. proven in >4 big racing nights, and every friday and saturday in Walker Mill Maryland, if anyone here is from MD that comes out any friday or saturday knows about a gold maxima on 18" silver and white maxima on 18" alloys, and if your on here and reads this i will prove it this saturday AGAIN so you can be a witness
95 maxima (fully Equiped) vs 98 maxima (center of gravity)
95-intake, 2.5 catback, 4" exhaust, high flow cat
98-intake, 2.25 catback, 2.5" exhaust, high flow cat, y-pipe (dont remember which one)
winner= 95 maxima by 1 1/8 car.............. proven in >4 big racing nights, and every friday and saturday in Walker Mill Maryland, if anyone here is from MD that comes out any friday or saturday knows about a gold maxima on 18" silver and white maxima on 18" alloys, and if your on here and reads this i will prove it this saturday AGAIN so you can be a witness
95 fully equipped are still lighter than 98s.....and the 4" u all speak of is only a styling tip has NOTHING TO DO WITH ANYTHING....its after the most restrictive part of the exhaust...the muffler....is purely there for looks.....the only thing that matter is the piping before the muffler in which case a madrel bent 2.25 will be perfectly fine...i agree with Apparation i lost a lil low end torque with 2.5...... :inb4RotaWheelComment:
http://forum.maxima.org/showthread.p...=turbo+exhaust
01-10-2007, 07:49 AM
#37
Originally Posted by toddemullins
If you want the ideal setup, do the job once and never look back.
Cattman headers and Y
Budget B
OEM Calsonic muffler from a 2k Max
My .02
Cattman headers and Y
Budget B
OEM Calsonic muffler from a 2k Max
My .02
Dollar for dollar, headers arent the way to go as far as the price for the gain goes on a NA 3.0.
A y pipe will do just fine.
01-10-2007, 08:02 AM
#38
Originally Posted by Grand_hustle17
how did you prove that you lost mids and top end TQ? did you dyno test before and after?, or is that what it feels like??? me and my best friend practices every thursday together and 3 way race every friday and saturday hes got a 2.25 and we both see the difference in 2.25 and 2.5, also on the way home we both top end on the highway and i always had the edge
I myself have had two different setups. An Apexi WS and now the Greddy SP and I didnt notice a difference between the two. From what Ive researched the Apexi WS was 2.25 and the Greddy is 2.5
I have had dynoed two different times, with two different setups and saw no real gain over the other. HP actually went down with the 2.5 but that could have been due to many other variables.
I can honestly say, that even going from Stock to a full catback I didnt notice any type of gain whatsoever other then tone.
With a Y pipe, I didnt notice any loss in low end either, just a nice pull above the 3k mark. I did notice a low end loss when I added an intake.
01-10-2007, 11:21 AM
#39
Originally Posted by ardika
Actually, I just installed Budget B w/resonator and 5gth gen muffler, I could notice some improvement under 3k these days. Before, just with the Budget Y-pipe, anything under 3k is slightly worse than stock....you know, pick up wise. The sweet spot is still 3-5.5k though, but I am just saying that with the B-pipe and 5th muffler, I could feel noticeable difference under 3k under mid/partial-acceleration (not WOT).
However, since I don't have any dyno sheet......take this with YOUR OWN grain of salt.
However, since I don't have any dyno sheet......take this with YOUR OWN grain of salt.