Engine noise after header install?
 

So i just installed a Borla UEL header and that while the UEL sounds great from the exhaust (Invidia N1 catback), i'm hearing a lot of noise coming from the engine area. It's a bit of a raspy, air-y, type rattle. it almost sounds like intake sound but to the rhythm of the UEL rumble, however i'm on stock intake. Am i just crazy and noticing this or could i potentially have an issue? It's most noticeable when giving throttle at low RPM's (2-3k ish).

I could just be paranoid, or it could be normal. I've really only heard the UEL on WRX's and such so typically there's a bit of turbo sound along with it, however to me this does not seem normal. I'm also running the Invidia N1 catback.

Any ideas?

Of course there would be more noise.. it's thin-walled tubular manifolds without heat shields. Stock are thicker with a substantial heat shield.

-alex

The wooshy noise is normal.

Well that's good news. Thanks for the information.

This is normal and has been covered many times. This is a result of the thinner metal of the aftermarket header which doesn't 'hide' the air flowing sound as well as the factory header does. You are fine.

Had the noise when I ran an OFH, now have a Tomei UEL and haven't heard it. My guess is because the Tomei is the same thickness as the factory manifold? even when I heard it with the OFH it was very feint.

As everyone else said, its the header which is thinner (ligther as well as a consequence) that doesnt mask the sound. The Tomei is a very thick header so it does not have the same sound.

I had the same with my borla and revworks.
When wrapped the revworks quieted down a lot, unsure of long term durability of wrap but I suppose I will see.

I also wondered if my header had a leak or something... just takes a bit of getting used to. Mine were leak tested etc when installed so I know they're fine - and after driving a bit I love the new sound (I just have header and OP - not the rest of the exhaust yet, so ALL my noise comes from the front)