4AGZE... effing loud?

Re: 4AGZE... effing loud? (old_mr2)

Tue, 03 Sep 2013 10:18:52 GMT

Minty,

The OEM air filter is not as bad as you think. My turbo connects to the factory air intake and I am putting down 241whp at 17 PSI. Stock gze.

Re: 4AGZE... effing loud? (dennis the menace)

Mon, 12 Aug 2013 08:25:04 GMT

" . . .I ended up putting a turbo on mine to shut it up."

And that's as good a reason as any, I suppose.

Re: 4AGZE... effing loud? (Minty AW11SC)

Mon, 12 Aug 2013 00:39:00 GMT

If you want to wake up your 4A-GZE motor, the first thing you want to improve is the intake and exhaust air flow. In stock, factory OEM trim, the air filter and cold air intake are very restrictive and inefficent. The exhaust header is also restricitve and weighs a ton. Moreover, the same can be said for the factory cat and exhaust system's. To do it right, these all have to be replaced.

Way back when Moses wore short pants, and MK1 parts were readily available, I chose the following upgrade's:

HKS Cold Air Intake with a properly matched K&N Air Filter

TRD 4-1 Exhaust Manifold Header that I had ceramic coated before installation. This header can become VERY HOT

JDM spec Trust exhaust system

These 3 mod's greatly improve the air flow in the 4A-GZE motor. One drawback however, is the noise. Everywhere you drive, you get heard before you get seen. Fortunately, where I live, I don't have to worry about decibal rating's or pollutant's in my exhaust....." />. This kind of upgrade is not for the timid/meek SC owner, epsecially if you upgrade the engine even more like I have......" />

Bottom line is this. Not every SC owner can get legally get away with modifying his exhaust. However, IMHO, if you can do it with impunity, and if you're OK with driving a LOUD car on the street, go for it!!!

It's great fun.

Regards,

Minty AW11SC

Re: 4AGZE... effing loud? (MCT_MR2)

Sun, 07 Apr 2013 12:42:52 GMT

good luck with making an exhaust quiet enough. you would have to look at running two mufflers to quieten it down. I had cusco powerball extractors with a 100 cell metal cat, a custom resonator and a varex, with it open and free reving, I topped out at 110db. I ended up putting a turbo on mine to shut it up.

Re: 4AGZE... effing loud? (worldwalker)

Sat, 06 Apr 2013 04:11:17 GMT

haha, Yes, you will want a 3 inch then. My SW20 was quieter than this and it was 3inch dump into 2.5in back with a single 22in 10x4 muffler. The problem I found with the AW11 was fitting a cat and resonator, but you wont need the resonator with a turbo. There is plenty of room for 3in following the stock path though, with a big enough muffler it should be quiet until its on song. From my measurements before making this, you'd have room for a bullet (or stock) cat and 9x5 muffler. I struggled to get anything bigger than 16in that wasn't baffled but it's Perth, you have to special order everything here.

Re: 4AGZE... effing loud? (Mrskylighter)

Sat, 06 Apr 2013 03:31:59 GMT

Thanks for the explanation Worldwalker. In my AW11 there is a Gen3 3sgte so a 3in should be alright with the turbo quieting things down a bit.
I've just gotta figure out how to get 3in pipe in there, with a dual (stock like) outlet and be semi quiet at the same time :) I might try and adapt an SW20 exhaust that has a single exit on the drivers side???

Your setup pictured above looks quality. Its a pity its slightly too loud.

Re: 4AGZE... effing loud? (worldwalker)

Sat, 06 Apr 2013 01:55:56 GMT

If you follow the path I went Mrskylighter you can easily fit 3inch. From behind at bumper hight all you can see is the tip, so you've got a good 3-4 inches of clearance before it gets ugly.

I'm surprised anyone would go for 3inch though, unless its turbo of course. Out of the dozens I looked at 2.5 was the biggest and the debate on forums was always between 2.25 and 2.5. To be honest I would rather 2.25 as I think 2.5 is too big but its a cost thing, 2.25 is expensive and hard to get parts off the shelf in Perth.

Another muffler set up worth considering are the offset offset same end. They're chambered and baffled at one end and usually kill most noise and resonance, the only one I could find in Aus was from magnaflow and only in 2.5 inch at $330 ($510RRP). There would be others (Borla perhaps) as I know its used aftermarket for the Golf R32s and 996/997 911's; I've seen them on a few other cars too. It means no need for a resonator and a much shorter system but the muffler is slightly more restrictive. If it wasn't going to cost me 2/3s the cost of the whole system for one muffler I'd have done it this way.

The last idea was a twin 2 inch with cross over into a cross over chambered 2 in 2 out muffler. Would have a tough sound.

Re: 4AGZE... effing loud? (Mrskylighter)

Sat, 06 Apr 2013 01:18:30 GMT

Chtonic
haha good luck mate, i have a full 3" system with the HKS headers on my aw11 SC and that thing is brutally loud. Good for waking the neibours up.

Would you mind posting a pic of your 3in exhaust setup? I am about to install a 3in on mine and am looking for ideas.

Re: 4AGZE... effing loud? (Chtonic)

Sat, 06 Apr 2013 01:02:19 GMT

haha good luck mate, i have a full 3" system with the HKS headers on my aw11 SC and that thing is brutally loud. Good for waking the neibours up.

4AGZE... effing loud? (worldwalker)

Fri, 05 Apr 2013 22:49:40 GMT

Ok so after reading up on exhausts and best advice I've finished my AW11 SC exhaust. It's a 2.5in manifold back (holds 4.9in area from ports to tip) It's a good 60-80cm longer than stock and most other custom/after market, 200CPI bullet cat, a 15x4in resonator and 4x8 16in strait through muffler. Other than my average welding (using gassless) and hopeless attempt at secondaries, its come up alright but its still f**king loud! Short of replacing the muffler with a 5x8 18in stainless, turbo or baffled muffler I cant think how else to shut it up. It sounds tough and deep with no rasp because of the huge resonator but I've got to try and get this through rego and I don't know if it will pass!

I don't get why the little 4A is so loud, its the same length and has more muffling than a WRX. Any other ideas that I could do to help it?