PING D16Y1 with P29 pistons and std head gasket

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Originally Posted by mugen_ctr

yeap, 2.5inch on my d-series as well.... nothing wrong with it, though low end torque suffers a lil bit, top end feels much better

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So do you agree with GSi_PSi? Or TheSaint? Because GSi_PSi's post includes a quote from a bloke stating that 3" would never make less power at any point in the power band than a smaller exhaust, therefore putting to rest the false theory that you need smaller exhaust on Honda engines to maintain back pressure for low-end power.


I have a 60mm mild steel exhaust for my EG sedan with a 5Zigen muffler, but I never put it on because I was of the idea that my low-end would suffer and since I use it mostly for daily/suburban driving this would not be ideal compared to say...a 2" setup.

My header is excellent. 4-2-1 ceramic coated 2" outlet, made by 'Flowtech' which is a subsidiary of Holley in the USA, who I believe have a lot of R&D + reputation (although bankrupt now lol).

So if I were to get either 2" or 60mm high-flow cat and install the 60mm cat-back + muffler on my D16Y1 I shouldn't see any low-end power loss at all?


That would be great, because I thought it would make the car drive like a bit of a pig...

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Originally Posted by dougie_504

So do you agree with GSi_PSi? Or TheSaint? Because GSi_PSi's post includes a quote from a bloke stating that 3" would never make less power at any point in the power band than a smaller exhaust, therefore putting to rest the false theory that you need smaller exhaust on Honda engines to maintain back pressure for low-end power.


I have a 60mm mild steel exhaust for my EG sedan with a 5Zigen muffler, but I never put it on because I was of the idea that my low-end would suffer and since I use it mostly for daily/suburban driving this would not be ideal compared to say...a 2" setup.

My header is excellent. 4-2-1 ceramic coated 2" outlet, made by 'Flowtech' which is a subsidiary of Holley in the USA, who I believe have a lot of R&D + reputation (although bankrupt now lol).

So if I were to get either 2" or 60mm high-flow cat and install the 60mm cat-back + muffler on my D16Y1 I shouldn't see any low-end power loss at all?


That would be great, because I thought it would make the car drive like a bit of a pig...

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goin from the saints post....

from my understanding and experience, the low end lost will be noticeable, but no to the extent where its un drivable like what every keyboard warrior says, top end will feel great, since it will breath much better, but as far as loss of torque, i can still keep up with traffic on a everyday basis...

Im no expert, but i remember when i got epa'd, the oem exhaust did make the car feel more responsive down low, so i will have to agree about the part about exhaust back pressure, but top end, the aftermarket cat back makes the car breath much better

If you are going to get it tuned then go for it. Untuned there would be very little gain from a catback.
Ive read that exhaust gas velocity is the key and while the 3" will be slower, it will no long be the limiting factor in your exhaust. After your collector everythings a restriction.
There is a good thread with 2.5 vs 3 for a H22 and at the bottom end, the 2.5 has more power for a 500rpm span just before 3000 rpm. From there its no contest.

And FFS, forget back pressure, its all exhaust gas velocity. You want as little back pressure as possible all the time, it is what limits the exhaust at lower rpm.

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Originally Posted by mugen_ctr

goin from the saints post....

from my understanding and experience, the low end lost will be noticeable, but no to the extent where its un drivable like what every keyboard warrior says, top end will feel great, since it will breath much better, but as far as loss of torque, i can still keep up with traffic on a everyday basis...

Im no expert, but i remember when i got epa'd, the oem exhaust did make the car feel more responsive down low, so i will have to agree about the part about exhaust back pressure, but top end, the aftermarket cat back makes the car breath much better

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i did notice a VERY SLIGHT loss in low end - but not enough to effect daily driving
my other mods pretty much make up for it though - ie lightened flywheel and CAI
i got a very nice low/mid boost from my headers - after which i installed the 2.5" stainless catback
so the catback just skimmed a little off the top of what i gained from the headers
but from installing the catback i did notice a nice boost in the top end
the only 2 problems are that my resonator buzz's at top end and my muffler is shot and drones like a humming power station

all in all - the D15b7 never really had any low end drivability in the first place lol
the only engine mod i can remember that helped daily driving was the headers

one thing that i will say is that my favourite 2 exhaust systems to date on cars were...
- the stock system on my Dc2 VTIR
- the Mugen catback on my Dc2 VTIR
they were both awsome

the stock system on a dc2 vtir is shithouse. feels like a gsi with it on srs.

thats strange - mine was great lol

Off topic question about O2 sensor. I have n*power header 4-2-1, it has 2 O2 sensors place . The 1st O2 is only reading from 1 cylinder. is it alright to allocate the o2 sensor to the 2nd O2 sensor in the end of the header?

^^Yep i run mine on the 2nd bung near the collector so it meters all 4 cylinders, you just cut the wire and solder in a new section of wire long enough to make it to the new location, make sure to heat shrink it as electrical tape will fall off under engine bay temps.
Link to pic of mine: http://www.ozhonda.com/forum/showthr...=1#post3033537

Thanks a lot mate. I have like 5 6 O2 sensors, everytime i go Pick-a-part i take one for free ;)

iv been meaning to do this for ages =p

Lol TheSaint you said that last time :) It doesnt take long, next time your servicing your car just whip it out and extend it :) Id probably reset the ecu after but dunno if thats nessicary i just tend to do it whenever i change things on the engine.

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Originally Posted by TbM

Lol TheSaint just whip it out and extend it :)

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sounds fun... =p

i honestly havnt had time to even look at my car lately =(