Exaust question

[Figit090]

I have a 1986.5 NA and I was checking out the exaust, and there appears to be two mufflers. there is a smaller one in the center of the car and then the one at the rear....

I was wondering why there are two, and my car is rather quiet so I was thinking i'd unbolt the rear muffler and take if off just to see what it would sound like.

BUT i didn't want to screw anything up...i know that backpressure and all that can effect the engine, and i was just curious if that second muffler is needed, what it will do without it, and what it will sound like without it, it's a no-name double tip...at least i couldn't see a brand. It doesn't look exensive and the records priced it at about 140 dollars i believe.

So what can I do that might help my car's sound/performance? What will taking it off do? I'd like to try it doday if i can in fact just slip it off - it looks like it's held on just by a U-clamp type thing and then the hanging mount.

[Figit090]

I found out that one may be a resonator...but i'm still wondering what different mods will do.

[Supracentral]

The forward "muffler" is a resonator.

The rear one is the actual muffler.

Your catalytic convertors will give your motor all the backpressure it could ever want (or not want for that matter).

However removing them both will likely make the car sound pretty shitty.

Removing the resonator in the middle will make it a bit louder, but it will still sound good.

[s383mmber1]

Correct. Remove the resonator, itll be louder.

[Figit090]

well that thing doesn't unbolt...and i read somewhere that removing it will make it sound crappy....

I was just wondering if it would sound good without the rearmost muffler, just a straight pipe or different exaust. is there any room for performance tuning in the muffler or is it just further up the line I.E. removing restrictions?

[s383mmber1]

having no muffler will sound like shit.

Dish out some cash and go aftermarket!

2.5 inch mandrel bent piping and muffler all the way for n/a's!

[Figit090]

i was just wondering if i could do anything without mods, and I know almost nothing about exaust...thanks for your help!

[s383mmber1]

start reading!

If you hollow your cat-converter itll be loud. And will definatly give ya some power

[supramacist]

Get rid of the secondary muffler all together and remove the baffle from the primary. It's a 50$ fix. You don't get better gas mileage..., you do get improved throttle responce and tone or depth. It's just my opinion and there is a reason it is free!

[supraman7mgte]

need to go to a bigger size exhaust,2.5 or 2 3/4

[dcrusupra]

2.75 at most. Anything bigger would be useless and probably rob power.

[supramacist]

You have more options than you realize you do.

[89Joe]

http://www.supramania.com/forums/showthread.php?t=15997

[1TuffSupra]

Man, my resonator was rattling like hell so I had it removed and replaced with a 2.25" pipe. Afterwards the exhaust note was a little louder but it made it sound raspy at lower rpms. If you want to make some changes to your exhaust i suggest you go aftermarket

[JAB89]

I recently installed the HKS Sport Exhaust on my son's NA and it sounds great! I love it. It has 60mm piping and a stock looking oval muffler with dual outlets for the sleeper look. Plus it has the years of HKS R&D behind it.

If you decide to spend a few bucks and get a great sounding top quality cat back system, here is the HKS site to read about it. The really neat thing is you can click on a video here and actually hear it!

http://www.hksusa.com/products/?id=789

And here is where I bought one at reasonable price:

http://www.nopionline.com/nopistore/dsp_part_detail.cfm?vmakeid=420&vmodelid=120&vcatyear=1989&vnopinum=001%2B0743&vTitle=TOYOTA%20Supra%201989

[bluemax]

The HKS Sport exhaust is a little loader than stock. It has that stock dual tail pipe look. I didn't notice any improvement in performance when I used it.

That video sounded a lot loader than mine.

[s383mmber1]

Are you planning on going turbo later?

3 inch exhaust robs some low end performance, but in top end they really perform for our n/a's!

-William

[NA86.5]

I have 2.5 exhaust straight back from the exhaust manifold to a Fireball racing mufler,its pretty loud but it has a nice deep grunt to it, oh yeah I dont have Cats on the car.:evil2:

[SupraChrisMk3]

I just put a 2.5" Pacestter Cat-back on my NA a couple weeks ago. Very easy install and it definately sounds better than stock. Not real loud though, just a little better. Idle to 4K RPM sounds a lot better, not that much of a difference from stock above 4K RPM though.

[Figit090]

those exaust vids are pretty sweet...

[7M-fanatic]

I have a 1986.5 NA and I was checking out the exaust, and there appears to be two mufflers. there is a smaller one in the center of the car and then the one at the rear....

I was wondering why there are two, and my car is rather quiet so I was thinking i'd unbolt the rear muffler and take if off just to see what it would sound like.
So what can I do that might help my car's sound/performance?

I removed the secondary muffler on my first 7M, and replaced it with a custom (by the local muffler shop) bent pipe so that the exhaust still exited behind the car,
It sounded GREAT! But not to loud.
The forward muffler is like what US pig-iron guys refer to as a "Turbo" muffler.
It is not just a resonator.

[Figit090]

I removed the secondary muffler on my first 7M, and replaced it with a custom (by the local muffler shop) bent pipe so that the exhaust still exited behind the car,
It sounded GREAT! But not to loud.
The forward muffler is like what US pig-iron guys refer to as a "Turbo" muffler.
It is not just a resonator.

so basically you just took off the muffler and replaced it with a pipe...just a pipe?

my muffler looks like it's just clamped on and i can unbolt it... i wonder if it will just slide off....

[7M-fanatic]

[QUOTE=Figit090]so basically you just took off the muffler and replaced it with a pipe...just a pipe? QUOTE]

Yes sir.
I had a 2.5" pipe made up, and welded on the flange off my original muffler.

If you have a clamp-on muffler, it most likely a replacement.

[Figit090]

yeah, it is....i have the reciept... so do do you think i could just pull it off to see how it sounds and then slip it back on if i don't like it?

[1TuffSupra]

if it clamps on and off then yes, lol

[Figit090]

well i knew they obvious but i asked because i was worried about metal warpage from the heat and constant pressure making it hard to put back on once i get it off.....

but i will admit to a rather silly question.... it just looks like it might come off and not go back on. but then again i forgot that tailpipe expanders exist...:icon_conf :biglaugh: