help with my exhaust~

[handsomeboy]

guys.. need help here. im driving a satria neo. n i did my exhaust at JFA, sunway.. 4-1 header, one mid box, 2 inches piping ( i think, or maybe 2.2 around there la) n HKS hyper muffler( straight).. the power is nice, the sound also nice.. its just that, its really noisy..

so just yesterday, i decided to change my muffler to a quiter one. a S flow. so i bought this tanabe hyper medallion from a friend of mine.. so i went to a normal exhaust shop, n change the muffler..

the prob is, i think my car has lost its power. i feel like the rpm needle really hard to climb.. unlike before.

so any suggestion? some say that i need to add another 'tabung' cuz its s flow.. really need the ZTH sifu opinion here... THANKS A LOT GUYS~

 

[mengz]

having a S-flow muffler increases the flow restriction. by adding another tabung, ur gonna increase the flow restriction even more.

IMHO, the power loss you feel is because you went from a straight flow to a S-flow. the exhaust gas is not as free flowing as before.

below are some links that might help.

Nissan Performance Magazine - Mike Kojima - Revenge of the Nerds - The Air Intake
NissanPerformanceMag.com - Revenge of the Nerds - Part 3

 

[Adeen]

ya lor....S-flow increase restriction...
that's why u feel hard to climb...
u just switch back to the straight flow and add another mid box to keep it silent abit...

 

[handsomeboy]

oooo really? hmm, but wat i heard, some backpressure is important for NA cars.. straight flows r for turbos.. thats wat i heard la.. but my HKS hyper sounds so nice, but so loud..

n s flows r suppose to be silent.. how come mine so loud? im really puzzled by this.. ????

 

[Adeen]

it also depends on the brand if not mistaken...
different co. use different technology in making exhaust...
my S-flow oso loud...it oso depends on what kinda mid box ur using....

from what i heard, some backpressure important for auto tranny cars...

 

[handsomeboy]

my mid box is from JFA.. i think custom made.. is there any possibilty that the fibre in the mid box finish d? i did the exhaust like 6 months ago.. the muffler's fibre still got a lot since my friend only use for 2 months only...

so how can i make the noise as low as possible with the max power as possible with this s flow

 

[Adeen]

ppl look more to silent exhaust setup when using S-Flow muffler and to power if using the straight flow muffler....this is from experience only...

u want power, u must sacrifice abit laa....have u seen any track car using silent muffler...??i myself would wan to use the apexi N1 muffler...:D..
just imagine the noise though....

dun shoot me if i'm wrong..

 

[handsomeboy]

yes,i know the power will sacrifice a bit.. but how come its noisy? if its silent then lost a bit power then its ok la..

 

[boyzone]

just use back ur straight flow muffler, top up another straight flow mid box to reduce the noise.

 

[kenzo]

bro, just get another mid box straight flow, kau tim, and ur hks hyper are u willing to let go? i can trade in with u another 2 mid box confirm silent, pm me best price if ur willing to sell, my titanium muffler no fibre already lol...