hissing from engine/header on acceleration

[melomood]

after i installed my vibrant header w/hfc i am hearing a hissing noise on acceleration doesn't matter at what rpm, seems to be louder at lower RPMs. I don't think it is a exhaust leak because i have checked many times no carb build up no idling problems, no nothing. i have all intake mods possible X-intake, P2r TBS, and P2R IMG and an Lsd exhaust. I think its just the noises from the engine but who know. just wanted some input on this.... thanks.

[qwerty :)]

how loud is the hissing? does it sound like an air leak, or does it sound more like air being sucked?

[ryryninja]

I also have that. I think its just the engine sucking in more air. But I ordered a gasket to place between the collector and the beginning of the exhaust piping. if its still there then I think it should be alright.

[mad monkey]

It's usually pretty easy to spot where the hissing is coming from. If it is the intake you should have been able to hear the hissing from the intake prior the header. A header makes a big difference in power but not that much suction wise through the intake. Check around the header from the head to the catback for anything loose. Anything around it that has gotten loose and is thin/flimsy will rattle and sound like a hiss. The collector to catback flange should leak without a gasket but some do experience leaks and get gaskets. And if you JUST put your header on you probably won't get a carbon buildup at a leak for a while.

[vtecmike1]

mine hisses after my install too under load. its the intake sucking in the air. at first i was like wtf this can't be right but its normal.

[JRM_FG2]

same thing when i installed my dcrh, i think its bc its new and needs to be broken in. had mine for over 500 miles and i havent heard the hissing in a long time.

[EastJunglez22]

installed DCRH a few days ago..i have and Injen SRI..same thing..hissing for only the first 2 days..and it does it in the cold..i think..i hope its normal

[Dar-Dar]

if the hissing comes from the intake, then thats normal.

[melomood]

i don't think it sounds like an exhaust leak and i just changes the exhaust manifold gasket to a brand new one and i have a new gasket where the header and midpipe meet.

[vtecmike1]

its not a leak its the intake, its just alot more air going through the system. your fine. i let mine idle for 15 minutes the day after my install cuz i was paranoid and there wasnt one drop of condensation on the garage floor underneath. i would think if it was really leaking it would drip something. or throw a cell ?

[Hondacivicsi23]

My dc race header hisses, done its been doing it since day one. Its normal. I kinda like the sound.

[Daishi]

its normal for an aftermarket header and intake to hiss a little bit. the intake is sucking in air.. usually a stock header is insulated more and thicker.. also less free flowing. the aftermarket header opens it up and air flows faster so you hear the air flowing through the pipes its normal. as long as you dont hear something rediculously loud u will be fine.

[BlackPearlSI]

I got this hissing sound from the P2R spacer alone, as have many who have one... is this a new sound or just louder then it was before? Id say its just the breathing mods you've done amplified an already existing "sucking" sound.

[nyblksi]

damn ive had the same hissing sound since i put my ssr header on. i thought something was loose. i guess this is a normal thing then

[streetmachine02]

if it were an exhaust leak... you can smell the gasses. it stinks. new gaskets are a must when you istall new parts... to prevent leaks

[melomood]

ya i changed the exhaust manifold gasket and the hiss was still present. i think its just what daishi said more air, more noise.