Quiet Headers?

[pepe]

if headers have thermal coating, reduce heat engine compartment? It would be less hot than headers original?
JDL headers can be installed preserving OEM overpipe?

[kch]

Originally Posted by pepe

if headers have thermal coating, reduce heat engine compartment? It would be less hot than headers original?
JDL headers can be installed preserving OEM overpipe?

1) Maybe. Stock header has a heat shield. I don't know how thermal coating compares to those shields. But the thermal coating is definitely worth doing.

2) Yes, but because the pipes are a different diameter, you might get some strange noises--that is, it may sound even more like a diesel at low RPMs than it does now.

[pepe]

overpipe change is best option ?

[Amputechture]

Keep in mind that header wrap will help muffle the sound a bit also.

[pepe]

What do you mean?

[CSG Mike]

Originally Posted by Amputechture

Keep in mind that header wrap will help muffle the sound a bit also.

Not really; if anything it'll make it louder due to the higher exhaust gas energy.

[pepe]

Originally Posted by kch

1) Maybe. Stock header has a heat shield. I don't know how thermal coating compares to those shields. But the thermal coating is definitely worth doing.

2) Yes, but because the pipes are a different diameter, you might get some strange noises--that is, it may sound even more like a diesel at low RPMs than it does now.

jdl uel sounds same a diesel????

[bfrank1972]

Bare aftermarket headers tend to 'ring' a bit more, especially the thinner walled ones. Not much of a difference outside the car, but in cabin you hear a lot more noise from them without heat shields and sitting above that thin metal panel. Not sure if header wrap will do much, maybe dampen the resonance a bit, but overall the shield on the stock headers is one of the reasons stock headers are quieter *in cabin*.

[pepe]

but not unbearably so, no? You can do many kilometers without going crazy?
not scare all the chickens, cats, dogs and grandmothers to happen?

[Lantana frs]

As I recall, my p&l header (catted) was no louder than stock. Everything in back of header was stock. I will get another header but leave everything else alone. I like quiet. Lol

[kch]

Originally Posted by pepe

jdl uel sounds same a diesel????

The noise isn't specific to the header. The engine itself sounds diesel-like at low RPMs.

[CatDaddysBBQ]

I have the topspeed catted header. It's marketed as UEL. It's TECHNICALLY unequal length, but by like 10%, not the drastically different length UELs that have the burble.

I'd classify it as EL, since it has more of a top-end power bump and sounds like an EL.

However, it still did wonders to fix the torque dip (with a OFT tune), and sounds great. It is louder than stock, for sure... But it's really quiet as far as headers go.

I have it paired with an axleback - so between the high-flow cat on the header and the factory mid-pipe/resonator it's got a GREAT growl under acceleration and has the occasional pop/burble under deceleration but idles and cruises at a near-stock volume. ZERO drone, as well. I honestly think it's perfect.

[pepe]

I have the axleback topspeed, i am very Happy, sound perfect

[Amputechture]

Originally Posted by CSG Mike

Not really; if anything it'll make it louder due to the higher exhaust gas energy.

Makes sense in that regard. Only first hand experience I have is going from unwrapped to having my downpipe, overpipe, and manifold wrapped. It definitely seemed to attenuate a lot of the unpleasantries although it could have just been from the pipes being new.