which is louder - induction or exhaust in mr2

[vrooom]

I got a 1991 Toyota MR2 mk2 which I purchased recently, it is too loud for my liking inside the cabin.
I am not sure which is louder in cabin, exhaust or induction since I'm profoundly deaf.

I can start _feel_ those noise when the engine spinning 5k+ rpm all way to 7000+ redline or wide open throttle.
Before I start spending the money, I'm looking to change the induction or exhaust for something quieter.

My setup-;
exhaust:
Decat pipe with Janspeed exhaust backbox, with 46mm pipes leading to twin 4.5" tailpipes, I will be changing the exhaust tips for something smaller like 50mm.

induction:
large bore 3" straight pipe to HKS green mushroom air filter pointing to side air vent, which right behind the seats in engine bay.

I am guessing the induction is louder especially in cabin? Will std airbox/upgraded filter quiten the induction roar?

[jimbob82]

the exhaust would be the loudest part atm

[Red Devil]

vrooom said:

I got a 1991 Toyota MR2 mk2 which I purchased recently, it is too loud for my liking inside the cabin.

Turbo or n/a?

vrooom said:

am not sure which is louder in cabin, exhaust or induction since I'm profoundly deaf.

Almost certainly the exhaust.

vrooom]quote said:

My setup-;
exhaust:
Decat pipe with Janspeed exhaust backbox, with 46mm pipes leading to twin 4.5" tailpipes, I will be changing the exhaust tips for something smaller like 50mm.

Are you sure? Far more likely to be a Japspeed. Note that on an n/a deafness can result - it is VERY loud. The pipes dimension you quoted is suspect. I don't know of any aftermarket exhaust with such small pipes. Most use 2.5" (63.5mm) so 64mm would be close.

Edited by Red Devil on Sunday 7th April 18:50

[vrooom]

N/A with 3sge engine.
New Exhaust time then.

I got them removed from my car yesterday. now looking around for new exhaust..

[vrooom]

here is the pics of exhaust...

[MGZRod]

Don't think i've ever seen a janspeed fitted to an MR2! I remember spending ages trying to find one for my ZR.

[Wadeski]

from experience, the decat increases the exhaust noise a lot, as will the aftermarket exhaut.

There are quiet performance exhausts out there like HKS Silent HiPower and Fujitsubos.

[digger the goat]

Without any joking etc.... Are you really deaf ?
(I am partially and My Sister profoundly)
Could it be resonance rather than 'noise'

[Meoricin]

Different tips to mine, but otherwise looks like the same system I have on my green 2. With a decat/mushroom filter combo, the exhaust was louder for me. With a cone filter/cat in place, the induction noise was louder up until around 4.5k rpm.

Indeed, I think this is only the third time I've heard of a Janspeed exhaust on an MR2 - and I spent quite a long time searching when I bought mine, to try to work out a value for selling it.

[TheHeretic]

On my old rev2 NA replacing the stock induction for a K&N made a huge difference win noise, far more than I have experienced with an exhaust, plus you get some lovely whistling noises behind your head.

[vrooom]

digger the goat said:

Without any joking etc.... Are you really deaf ?
(I am partially and My Sister profoundly)
Could it be resonance rather than 'noise'

Yes completely stone deaf in both ears. I'm more worried about DB levels required to enter some track days. I fear mine is too loud.

[Red Devil]

MGZRod said:

Don't think i've ever seen a janspeed fitted to an MR2! I remember spending ages trying to find one for my ZR.

Nor have I, hence my mistake. Rocking horse *** comes to mind. Not sure I get the point of combining huge tips with such small diameter pipes though.

[The Flying Ox]

If you're going for quiet, try a Mongoose exhaust, or even go back to the stock Toyota one. The decat will be having quite an effect too.

[vrooom]

What about changing exhaust tips? can those have effect on sound volume? the pipe flared from 46mm pipe to 4.5".. so megaphone effect ?

[SonicShadow]

MGZRod said:

Don't think i've ever seen a janspeed fitted to an MR2! I remember spending ages trying to find one for my ZR.

I have a JanSpeed exhaust on mine. Would have cost the previous owner (who I assume fitted it) a fair bit of money at the time!

[SonicShadow]

The Flying Ox said:

If you're going for quiet, try a Mongoose exhaust, or even go back to the stock Toyota one. The decat will be having quite an effect too.

Decat makes a big difference to noise... some companies do make baffled decats though which tone it down quite a bit compared to a basic straight pipe.

[Mastodon2]

vrooom said:

What about changing exhaust tips? can those have effect on sound volume? the pipe flared from 46mm pipe to 4.5".. so megaphone effect ?

Next to nothing in reality. Look at a Spoon N1, a popular exhaust for Honda Type Rs, compared to a a Buddy Club Spec III.

The N1 is a peashooter next to the Spec III:





The Spoon has about a 2" tip, the Spec III is 4". Both are just about as loud as each other - loud as fk tbh. The tip size means little, the amount of baffling or the lack thereof and the speed of gas flow through the exhaust is the important bit when it comes to noise level.

Edited by Mastodon2 on Wednesday 10th April 20:48

Edited by Mastodon2 on Wednesday 10th April 20:49

[Baryonyx]

Mastodon2 said:

Next to nothing in reality. Look at a Spoon N1, a popular exhaust for Honda Type Rs, compared to a a Buddy Club Spec III.

The N1 is a peashooter next to the Spec III:





The Spoon has about a 2" tip, the Spec III is 4". Both are just about as loud as each - loud as fk tbh. The tip size means little, the amount of baffling or the lack thereof and the speed of gas flow through the exhaust is the important bit when it comes to noise level.

Quoted so the image works.

[vrooom]

I bought a 2nd hand replacement de-cat with resonator (japspeed) to replace my blowing pipe with bad ends. I should have checked if the exhaust are blowing. they are blowing on flanges, the decat pipe was badly welded homemade pipe.

I will be keeping backbox and see how it go.

I will be changing the exhaust tip for something smaller and sensible sized. like 2.5" or something. I need find a local welder who are willing to weld on new tips on for me.

[Mastodon2]

By all means change the tips if you don't like the look of the current ones, which look like 4", but don't kid yourself that it will be any quieter with smaller tips on. You could cut the tips off altogether and it wouldn't make any real difference to the noise.