Biggest power exhaust?

[Championship White]

There is a thread on here somewhere that showed a dc5 losing 8bhp on a twinloop from a buddy club system

On an EK9 that would be like 3-5 BHP, I'd rather lose those few BHP's than have my eardrums bleed. You wouldn't even feel the difference.

 

[b16 mini]

spoon n1 has the 2 1/4 bit as it is also designed as a direct fit to the oem b pipe.

look at fujitsubo, buddy club, j's, anything with a 2.5" through out.

 

[murphy2]

i went for mugen because i dont want noise as said above i would rather loose bhp than the noise maybe im geting older but js is good exhaust if u can live with the noise no dougth is the best out there.

 

[_JT]

On an EK9 that would be like 3-5 BHP, I'd rather lose those few BHP's than have my eardrums bleed. You wouldn't even feel the difference.

Yeah and thats only talking about top power. I agree that the TL is a bit more restricting and the 2.25" part is a design flaw (luckily I have an OBX waiting that dampens just as much sound but is 2,5" all the way through) but if the TL system would mean 8hp less, then you're implicitely saying that changing from stock to something like an N1 system would mean you'd gain more than 10hp on a B16B. Sorry, but I can't believe that you gain 10hp in a B16B by just moddifying the exhaust I think the TL would maybe be a 1hp or 2hp difference from something like N1 and that the rest of the so-called loss is more of a placebo loss because of the lack of sound.

I also think you can't compare it on a K20; K20 optimum exhaust size is 3", B16 2,5". TL is only off 1/4th inch on a B16, but 3/4" on a K20. A BIG difference imho.

 

[HornetSting]

Spoon N1 with b pipe and manifold (bin the cat too, was the biggest gain I got!).

 

[4d_ek9]

my ek9 with a mugen 4-1 and twinloop made 177 bhp and with a 100% oem exhaust it made 181bhp on the same RR go figure it relf well restrictive with the mugen on, it sounded nice tho lol apexi n1 sounded and felt the best on mine

 

[jugbugz]

Yeah and thats only talking about top power. I agree that the TL is a bit more restricting and the 2.25" part is a design flaw (luckily I have an OBX waiting that dampens just as much sound but is 2,5" all the way through) but if the TL system would mean 8hp less, then you're implicitely saying that changing from stock to something like an N1 system would mean you'd gain more than 10hp on a B16B. Sorry, but I can't believe that you gain 10hp in a B16B by just moddifying the exhaust I think the TL would maybe be a 1hp or 2hp difference from something like N1 and that the rest of the so-called loss is more of a placebo loss because of the lack of sound.

I also think you can't compare it on a K20; K20 optimum exhaust size is 3", B16 2,5". TL is only off 1/4th inch on a B16, but 3/4" on a K20. A BIG difference imho.

Any twin loop is restrictive because of its design. Its flaw in maximising Top End power, comes from where it looses momentum by making a 360 degree turn. Faster air flow = higher CFM.

Twin loop setup is good for the street where low to mid range is important and for the people who cant stand exhuast drone.

For Maximum power, its not good whether or not you compare a 2.5" straight through vs a 2.5" twinloop.

Its true that you can loose 8whp or more but ofcourse this only happens at a certain RPM, doesnt mean the difference is always at Peak HP. I gained 30whp on tuning alone @ mid range RPMs. This is totally different from gaining 30whp at Peak HP.

I'd suggest to anyone who has issues with drone to look into a Xforce Varex Muffler. XForce - Performance Exhaust Systems
Its a straight through design with a motorised flap that once activated, it diverts the airflow into circlating the muffler walls and out again, just like a twin loop. This is all controled by the flick of a switch. you can adjust how much the flap closes just like your Audio volume knob.
http://www.youtube.com/watch?v=K7jGYnhbQQU&feature=player_embedded#!
http://www.youtube.com/watch?v=FNlgw1COym8&feature=player_embedded#!


I have this on my Missus DC5R with full TODA headers + 2.5" catback. Pics attached.

You can see the Flap closed, which diverts the air flow to the sides of the muffler and out again.

Lovely Toda racing headers had to get hacked to have a High flow Cat fitted.

 

[murphy2]

i have tL on my car at the moment with oem b.pipe and js 4-2-1 and Decat before this what i notice from this 2 is i gain low to mid range pick with the tl what i notice with the js is top end my mate as an sir with oem system when i had my js i do find it hard to catch up with him in low to mid but on high rev i take him tbh i prefere low to mid as this prob help in 1/4 mile let me know if im wrong im gana dyno the car to see if any thing as change and ill post the result.

 

[021-bennettt]

Get a good mani, decat or resonated deact and a 2.5inch under axle exhaust system! Thats what i would do mate

 

[leeK9]

i have tL on my car at the moment with oem b.pipe and js 4-2-1 and Decat before this what i notice from this 2 is i gain low to mid range pick with the tl what i notice with the js is top end my mate as an sir with oem system when i had my js i do find it hard to catch up with him in low to mid but on high rev i take him tbh i prefere low to mid as this prob help in 1/4 mile let me know if im wrong im gana dyno the car to see if any thing as change and ill post the result.

well it wont make 1/4 mile time beter

you only need low/mid power for the first gear take off

you should be in the highs revs every gear thereafter

at the end of the day honda's where made for high rpm power and all that the low/mid range improvements give you is easier drivability

 

[ng_b18ek4]

Mugen Twinloop is the heaviest out of all^^

 

[murphy2]

when honda makes the ek9 they put the oem system on for a reason i know it can be beter
as put after market exhaust for beter breathing i dont know how oem could be beter than twinloop as it should mate the car breath beter i have js 4-2-1 ,js decat oem b.pipe and twinloop axle back i feel the car pulls well and more drivable as i use it for daily drive i got my car dyno with js system now im gana dyno it with the new setup and see if any difrent what ever the outcome ill still be happy with it.

 

[rvm]

Mugen Twinloop is a excellent exhaust, it all depends if your car is used for a daily drive, or for a weekend/track car. If my ek9 was a daily drive car I'll definitely install a mugen twinloop over a spoon n1 for example.. why ? because I can't handle the noise! hehehe

 

[Brian]

I've got 5zigen pro racer headers, and a 2.5in Invidia N1 catback on my EK4: 177HP and 161NM...noise? What noise? It's just music to my ears...

 

[_JT]

Any twin loop is restrictive because of its design. Its flaw in maximising Top End power, comes from where it looses momentum by making a 360 degree turn. Faster air flow = higher CFM.

Twin loop setup is good for the street where low to mid range is important and for the people who cant stand exhuast drone.

For Maximum power, its not good whether or not you compare a 2.5" straight through vs a 2.5" twinloop.

Its true that you can loose 8whp or more but ofcourse this only happens at a certain RPM, doesnt mean the difference is always at Peak HP. I gained 30whp on tuning alone @ mid range RPMs. This is totally different from gaining 30whp at Peak HP.

I never doubted that, but don't forget that on the Mugen it's not only the bends but also the 2,18" restriction that costs hp. Personally, I think that on an EK9 the difference wouldn't be that big. 8whp on a DC5 is a completely different matter since optimal exhaust size is AFAIK 3". That means that the 2,18" restriction is a lot further from the optimal exhaust size than for a B16, which has 2,5" as the optimum size.

Let me repeat again that I'm not doubting that it's a more restricting system than straight, but
- 1. it's not only the bends but also the 2,18" restriction so it's still unkown which of the 2 "flaws" zap the most power
- 2. on an EK9 the optimal exhaust size is 2,5". On an EK9 a twin loop is only less than optimal at that restriction. On a DC5 it's restricting all the way cause it needs 3" and even more restricting at the 2,18" part.

That's why I don't think it's a fair comparison with a DC5. Let's see what a DC5 does with power, when you compare a DC5 with 3" straight through and then on the same car a 2,5" straight through with 2,18" restriction.

I find it kind of hard to explain. But I think one variable is being overlooked, like I tried to explain above

I'd suggest to anyone who has issues with drone to look into a Xforce Varex Muffler. XForce - Performance Exhaust Systems
Its a straight through design with a motorised flap that once activated, it diverts the airflow into circlating the muffler walls and out again, just like a twin loop. This is all controled by the flick of a switch. you can adjust how much the flap closes just like your Audio volume knob.
YouTube - Varex remote control muffler.!
YouTube - VAREX remote control adjustable exhaust for Holden VE!


I have this on my Missus DC5R with full TODA headers + 2.5" catback. Pics attached.

You can see the Flap closed, which diverts the air flow to the sides of the muffler and out again.

Lovely Toda racing headers had to get hacked to have a High flow Cat fitted.

What does that cost? And any numbers known on how much db's are dampened? I know for the OBX Twin Loop that I have sitting in the garage (which is 2,5" all the way, unlike the Mugen) it takes away as much as 19-20db compared to straight through.

 

[BuddyClubctr]

hey m8s.. does anyone of you knows about buddy club spec 3 racing mulfer??
i know its way 2 loud but it give me great torque through the whole rpm rage especially on high rpm and take in mind am producing 203 whp with a b16b..

 

[abunai888]

hey m8s.. does anyone of you knows about buddy club spec 3 racing mulfer??
i know its way 2 loud but it give me great torque through the whole rpm rage especially on high rpm and take in mind am producing 203 whp with a b16b..

my suggestion is to find a good exhaust maker and go custom for max gains you can use bigger dia piping for better gains in high rpms and big ressotators for low sound.
i've seen some mid boxes failing and rattle on buddy club exhausts buddy club replaced them for free but the problem came up again(

 

[eg6-b18c6]

For a 1.6L-1.8L go for the 2.5" free flowing system with no restriction. This will maximise Top end power. Twin loop does not!

Be sure to have a high flow cat, it'll cost more but sound better and no difference in restriction.

This man speaks sense