Jump to content
SAU Community

Recommended Posts

Hey Lads.

With my impending date with the EPA comin next week, im just in need of one more part. I spoke to the geezers at RE customs, they think that If I just change my exhaust from the Cat back I should be sweet with passing Noise and Emissions test. Now With so many brands and Sizes out their Im a Tad confused, Im assuming 3'' will definantly be a winner with noise. but what Make and Model should I get and How much am I looking at forking out.

Cheers.

Link to comment
https://www.sau.com.au/forums/topic/228760-epa-friendly-cat-back-exhaust/
Share on other sites

Hey Lads.

With my impending date with the EPA comin next week, im just in need of one more part. I spoke to the geezers at RE customs, they think that If I just change my exhaust from the Cat back I should be sweet with passing Noise and Emissions test. Now With so many brands and Sizes out their Im a Tad confused, Im assuming 3'' will definantly be a winner with noise. but what Make and Model should I get and How much am I looking at forking out.

Cheers.

hey mate. umm i gpt EPAd before on my N/A 34, and since i had a sports exhaust on which was fairly loud and didnt have a stock one i had one made up (to pass epa) from the cat back. which is a stockish one for about $100 if you wanted to borrow it to pass the test you could. thats only if you wanted to put your old one back on after.

otherwise to get one made up from the cat back you'll be quoted most probably about $500. pretty much most sports exhausts i found out are 'illegal' cause of the noise decibal level as our car can only have a 90 decibal limit. i passed mine with my stock made up one got 84 decibals.. lol

heres a pic attachment of the stock system if you want to wish to borrow for EPA.

post-45807-1216440030_thumb.jpg

Just remember they note down the size of the exhaust you go to the test with.

So later on, if you get defected again and again for a noisy one, and then keep rocking up with a smaller one... you'll be in a spot of bother with fines and what not.

Just something to remember. Once is ok, i wouldnt try it 3-4 times.

Just remember they note down the size of the exhaust you go to the test with.

So later on, if you get defected again and again for a noisy one, and then keep rocking up with a smaller one... you'll be in a spot of bother with fines and what not.

Just something to remember. Once is ok, i wouldnt try it 3-4 times.

This is very true! they also count how many mufflers/cats you have and make a sketch of what your exhaust system looks like!

so if you get caught a few times either get a 3" system made to comply with the allowed noise levels or pay the $30 to get new number plates lol

^ this i did not know, cheers for the info Ash/Ruffels

i have a HKS Super Dragger catback (modified from an R33) that is as quiet as anything.... at track days and what not, where the cars are idling, get numerous people asking if my car is even on.

The rest of the system is full 3" stainless, split dump/front pipe, 3" hi flow cat. So it is possible to have a 3" system, with a jap aftermarket catback that is legal.

I don't know what db my exhaust is, but not one cop has even bothered to check it when i've been pulled over. But it's f*cking huge exhaust though, 5" tip i think and the main part obviously bigger again, might have something to do with it, i dunno. Shelter for the homeless exhaust i call it :)

what will they do to you if they know you keep changing your exhaust? like u just put a small one on to pass, then put 3" back on, and keep doing that, if they know you are, what will they do to you?

umm im not 100% sure but im pretty sure you keep getting bigger f**k off fines, i read on the sheet something like up to 6,000 not sure though might have to confirm with someone else.

^ this i did not know, cheers for the info Ash/Ruffels

I don't know what db my exhaust is, but not one cop has even bothered to check it when i've been pulled over. But it's f*cking huge exhaust though, 5" tip i think and the main part obviously bigger again, might have something to do with it, i dunno. Shelter for the homeless exhaust i call it :D

Sounds the same as what I've got on the GTR, the exhaust varies from 2.75 inch to closer to 3.25 inch on the outside so I'm pretty sure its a 3inch, HKS Super Dragger muffler (with massive tip, JASMA approved), and large mid-muffler.

Extremely quiet on idle but loud at high revs, so unless you drive around the street at 5K RPM your fine :)

Unfortunately there not made anymore, but there's plenty of other choices out there.

Daldar exhausts can install a Redback Sports catback/pipe system for ~$350 which is designed to sit just under the EPA Level Although its not an asian brand its a good option if you wanna stay safe.

I plan to have one installed in a few weeks with just a really loud rear muffler on and if i ever get EPA's just have them switch out the muffler for the redback recommended one and i know im safe.

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now


  • Similar Content

  • Latest Posts

    • Well, in 2007 he must have been charging about $1800 an hour. He only looked at the car for 5 minutes. And another 4 to write the report wrong, and another minute to correct it. Mind you, this was for a car that was: Stock engine, fmic (hole in drivers guard), all alloy intake and custom air box, 3 inch turbo back exhaust, lowered, and a set of 17" Advans (255/40/17 rear and 235/45/17 front). It was nothing crazy. The blue slipper wanted the "hole in the guard" engineered. But that was because he got the shits that I wouldn't "relocate the battery from the boot, back to the factory position in the engine bay"... In an R33 GTST...     Also for emissions, E85, and don't go wild on timing. It's amazing how the closer you get ignition timing towards max torque, the last couple of degrees really throw NOx counts right up. And for the huge increase in emissions, it's only a small increase in torque.
    • He'll be looking down and swearing about "the damn apprentice" for trying to convince Duncan to use percussive maintenance... 😛  
    • I swear at my GKTech ones every time I have to take them apart and replace a spherical. But I wouldn't swap them for anything else. They absolutely slay every other option, at least in terms of how they actually work. You sure you don't want to live with bearings? I mean, they don't have "ball bearings". They are rod ends and sphericals throughout. Tough as nuts, even though I have found more than one way to wear them out.
    • From when I was looking at getting the 86 engineered for the turbo, the joint said to put in a few euro 5 or 6 cats, then tune the car on a nice clean E85 tune When I was looking at a turbo for the MX5, it was basically the same thing, a couple of cats and a nice clean tune Although, it will depend on the year of the Jeep IRT emmisions standards required, and what mods are done, especially if it has a newer engine installed that requires a higher Euro
    • Yeah - but it's not actually that easy. There are limits for HC, CO, NOx and particulates. Particulates shouldn't be a concern in any petrol engine unless trying to comply to the very latest Euro standard. But getting a tune right so that all the others stay within limits AT THE SAME TIME is not a trivial exercise. You couldn't possibly get it right by just guessing at the tuner's dyno, unless he had a 4 gas analyser up the pipe, which is not often the case these days. It used to be. Every decent shop that did "tune ups" (as opposed to tuning) would have a 4 gas analsyer. Perhaps there's still quite a few of them around these days. But most "tuners" are only watching O2 and power readings.
×
×
  • Create New...