Quieting the 1JZ-GTE Exhaust

Cruiserhead05

New Member
Authorized Seller
Joined
Sep 17, 2007
Messages
21
Likes
0
Location
nova
#1
My 1jz is currently running a 3" downpipe and full 3" exhaust.

In order to pass inspection i'll be installing a pretty basic 3" cat.

However, the exhaust is very loud, even in the cressida, and I have already gotten heat from cops for it.

The current exhaust appears to have a long(18" or so) resonator but i wanted to see if there were any obvious suggestions to quiet things down.

Would replacing the resonator with a glass pack be a good idea?

FWIW, I'm more concerned with Db reduction then power loss. If i loose a little power it wont be the end of the world. Also, since it may matter, the engine has stock c12 turbos, etc.
 

GotBoost?

I do
Authorized Seller
Joined
Nov 25, 2005
Messages
318
Likes
0
Location
By My Computer
#2
Your neighborhood muffler shop could weld in an extra resonator. For a little bit more, they would wled flanges in so you can replace it at will.
 

tlo86

Ninja Editor 'Since 05'
Authorized Seller
Contributor
Joined
Jul 24, 2005
Messages
3,914
Likes
1
Location
Colorado
#4
my exhaust is quiet on my 2j. i have a high flow cat and a complete HKS catback. of course once the wastegate opens its a different story :)
 

Pernilongo

LADA is my daily
Authorized Seller
Joined
Jul 15, 2007
Messages
446
Likes
0
Location
Los Angeles
#10
I'm running 2 Vibrant ultra quiet resonators because they are so short and N1 apexi muffler, also i have metal core 3" cat that is actually made the car quieter than magnaflow 3" ceramic cat which made the car sound like shit besides being loud. but honestly i spent alot of money trying different resonators and Vibrant seems to be the best out there. dont waist your money on glasspack. learn from my mistakes. My car never set off an alarm, it gets lost in the traffic very well, in two years not a single cop stopped me and thats with 3" all the way from a turbo without a silencer. I also tried Apexi silencer with spring mechanism which opens under pressure, that was still when i didnt have cat or resonators and this silencer is just a waist of money. Anyway, this set up is very respectable on a street in my subjective oppinion. it doesnt make your car sound like you are on a budget. it is just a bit louder than old g coupe or FX 35 at full throttle and way way quieter than any integra or CRX with straight through. so it is very civilized and grown up exhaust set up.

P.S. Stock twins cofig
 

Cruiserhead05

New Member
Authorized Seller
Joined
Sep 17, 2007
Messages
21
Likes
0
Location
nova
#11
Pernilongo,

Sounds like what i'm looking for. Where did you source the Vibrant resonators and Apexi?
Also, got any pics?
 

honestabe

Happy as hell :D
Authorized Seller
Contributor
Joined
Jan 15, 2006
Messages
3,712
Likes
0
Location
Mount Vernon, WA, USA
#13
To hell with the cat. Just put a silencer in it (I only put mine in when racing after 10PM at PIR to meet the Db rating requirement). If you are going to install a cat, get a high-flow 3" cat. Installing a glass pack will make the car louder. My dad used to have Purple Horny glass packs on his California Special Mustang (532 RWHP) and he would shake windows to the point that they almost shattered, along with making most people deaf from the roar (temporarily of course).

Adam
 

Pernilongo

LADA is my daily
Authorized Seller
Joined
Jul 15, 2007
Messages
446
Likes
0
Location
Los Angeles
#14
Yeah i'll make some pics today, no problems. as far as sources is concerned i think my N1 turbo muffler was around 160, from optionimports.com resonators around 80 each from Verocious Motorsports, and cat i just don't remember but i think verocious also have them. These parts are not cheap, so another option that i didn't have is the full cat back, i think Tanabe came up with Medalion touring concept G for MK3 and they say it's under 93db which is better than old medalion hyper which is not that quiet. I don't know what is more cost efficeient buying parts or just adapting this cat back from tanabe.
 

Scot

Enough is Never Enough
Authorized Seller
Joined
Jan 9, 2008
Messages
185
Likes
0
Location
Houston, TX
#15
I am 3" all the way to the Apex N1 with a tube type resonator. This is my second / longer resonator searching to tone it down, which it did a bit. Did you install one res, before and after the cat? I have a test pipe where I can easily install a cat, but there doesn't seem to be enought room to instll two resonators together....from the cat back.

Thanks for the input on the Apex silencer that did not work because I was thinking about trying one. You saved me some $$.
 

Pernilongo

LADA is my daily
Authorized Seller
Joined
Jul 15, 2007
Messages
446
Likes
0
Location
Los Angeles
#16
Both of my resonators are after cat. They are only 14" long and 10" for a cat. i think my cat is in place of stock cat and then one of the resonators about 9" after it and the second resonator is in place of stock pre-muffler or whatever this thing is. on picture 2 is a ground clearence.
 

Attachments

Cruiserhead05

New Member
Authorized Seller
Joined
Sep 17, 2007
Messages
21
Likes
0
Location
nova
#17
Got around to adding the cat. It made a minimal difference, at best. In the future, i hope to take some of the advice given here to quiet the cressida down for a more pleasant DD experience and will post up with results.

Thanks
 

tturnpaw

Supra Enthusiast
Authorized Seller
Joined
Feb 10, 2007
Messages
412
Likes
0
Location
Everett, WA
#21
I plan to get a louder, deeper, throatier muffler. If my neighbor thinks my car ias loud now, just wait.
haha ill have to take a vid when my 2js done.....you think you'll have loud...you just wait...

oh and by the way, YOUR 1J IS LOUD!!! haha :)
 

Cruiserhead05

New Member
Authorized Seller
Joined
Sep 17, 2007
Messages
21
Likes
0
Location
nova
#22
Finally got around to bringing the cressida into a shop to get some advice and see what can be done.

Because the 3" in the cressida is so tight, it leaves very little room for any improvement. The only thing they are thinking to do is go with a different muffler and drop the pipe to 2.5" just before the muffler.

Any thoughts
 

bluemkiii

redmkiii's little brother
Authorized Seller
Joined
Jul 25, 2007
Messages
729
Likes
0
Location
phoenix, AZ
#23
Finally got around to bringing the cressida into a shop to get some advice and see what can be done.

Because the 3" in the cressida is so tight, it leaves very little room for any improvement. The only thing they are thinking to do is go with a different muffler and drop the pipe to 2.5" just before the muffler.

Any thoughts

Performance is going to suffer, 2.5 is alittle restrictive.
 

Cruiserhead05

New Member
Authorized Seller
Joined
Sep 17, 2007
Messages
21
Likes
0
Location
nova
#24
I guess it depends on HOW MUCH which really will play a role in the decision process.

They're advocating do just a small section which will have the drop down from 3" to 2.5" then a larger muffler.

Here is the muffler i was looking at:
http://vibrantperformance.com/catal...id=52&osCsid=4a16589a78e66816f61cae7b4e155bfc

It seems like it would be quieter then what i currently have b/c of its larger size, plus it would help with the sleeper effect.
 

zoppii

Pro Lurker
Authorized Seller
Joined
May 21, 2007
Messages
100
Likes
0
Location
Palm Harbor
#25
The Tanabe Super Hyper Racing Medallion exhaust I have on my Supra 1J is actually pretty quiet until you romp on it. Before this exhaust I put an Apexi ATS in my N1 muffler and it worked really well. I was supprised the spring load was as accurate as it was and here again for daily crusing it's quiet but when you go WOT it give's you almost the same exhaust sound as without a silencer with no real noticable drop in power. For $125.00 it's worth a try. I agree that 2.5 might be a bit performance degridating and you might be sorry.
 

ReQuieM

malicious.com.au
Authorized Seller
Joined
Oct 14, 2006
Messages
270
Likes
0
Location
Melbourne, Australia
#26
Brand doesn't have a whole lot to do with quitening down the exhaust. Get what ever brand you like just make sure you get an offset-offset or centre-offset. Its the offsetting that will remove most of the noise form a 1J. Past that its internal design, If you can a straight through offset-offset glass packed muffler will give you low noise and power.

It is EXTREMELY possible to have a zero loss exhaust that is also quite, its just with smart choices. If I were you I would make a 3" fit, there are alot of brands out there, there should be one that has a low barrel hight to fit with your tight clearences. If not, you only need two extra cuts and welds to angle the system down slightly to make extra room. The shop saying it wont fit is them just being lazy :p

OH I previously had the Blitz NUR I have just pulled it for a system I built. For those interested the power difference between having the silencer in and no silencer was 45rwkw! thats 60rwhp on a back to back run on a dyno. Lesson? if you don't want a load exhaust make a good flowing quite one, DON'T run a loud one with a silencer :p

PS my blitz is currently for sale for those of you in Australia! :D
 

di_rosa

never ending project ...
Authorized Seller
Joined
Apr 2, 2005
Messages
215
Likes
0
Location
toronto
#27

Cruiserhead05

New Member
Authorized Seller
Joined
Sep 17, 2007
Messages
21
Likes
0
Location
nova
#28
I think the resonator and muffler from vibrant would do the job, the never ending problem is clearance. The cressida seems to be much different then a supra in that things are much tighter with a 3" exhaust already in place.

The last suggestion the shop had was to redo the whole exhaust with 2" (minimum $800 bucks). No thanks. I'd like to quiet things down a little but not at such a large expense of $$ and power.
 

Cruiserhead05

New Member
Authorized Seller
Joined
Sep 17, 2007
Messages
21
Likes
0
Location
nova
#29
It is EXTREMELY possible to have a zero loss exhaust that is also quite, its just with smart choices. If I were you I would make a 3" fit, there are alot of brands out there, there should be one that has a low barrel hight to fit with your tight clearences.:D
If anyone has suggestions for something like this, please make them.

I'll be the first to admit i'm ignorant with exhuast systems on these vehicles and need the most help possible.

thanks
 

ReQuieM

malicious.com.au
Authorized Seller
Joined
Oct 14, 2006
Messages
270
Likes
0
Location
Melbourne, Australia
#31
How do you mean? advise on making a zero lose setup or on a muffler that will fit?

If you after a fitting muffler, jump on jegs, they have heaps of mufflers listed along with their measurements. Squeeze under the car with a tape measure and see how much room you doo have or what can fit.

I personally like the look of the Cherry bomb vortex mufflers, I probably would of dropped one in my setup if I could get them in Australia :p Although they do seam to be a bit louder then a standard offset-offset straight through. But they are a slim fit which is good. I think magnaflow have decent sized ones too.

You first por twould be to work out how much space you do have, either by replacing one already there on adding one in a decent length of straight piping. AND don't be intimdated by it being an 'exhaust' its just a bit o piping wioth some boxed whacked in. Thing of it as drain pipe if it makes it seam easier :)
 

ReQuieM

malicious.com.au
Authorized Seller
Joined
Oct 14, 2006
Messages
270
Likes
0
Location
Melbourne, Australia
#32
Yup that magna flow looks alrgiht, just make sure its straight through AND that you have a stainless steel setup :) 4" tall its a good height and I have heard good things about the magna flows.

No on teh gibson, its a full 8" diameter, so it will be 2" taller then the magnaflow, which wont help ground clearance.

UNLESS you have ground clearance but need space on the sides, in which case the former is better :)

See why you need to go measure ;) :D
 

Liau.Bdar

New Member
Authorized Seller
Joined
Aug 16, 2007
Messages
4
Likes
0
Location
Kilanas
#35
if you could get a muffler shop to make you some 2.5" twin dumps all the way back joining in the end with a twin inlet muffler, you can run 2 cats and 2 mid-mufflers. you'd get a quiet system with better flow than a single 3" and no droning. I did this on my cressida without the cats, just the three mufflers.