swaangin

Looking for some videos, maybe some reviews on how they like their ride after they got it done. Torque issues due to loss of back pressure?

tofuprod

Not to sound like a complete asshat, but why?
Is it just for sound, aesthetics or?

Rarely have I heard (or seen) a car with deleted mufflers that truly sounded pleasing to me.

Pittsy

Before I installed my q300, i left my mufflers off and did some runs in it. It sounds absolutely beautiful, not going to lie. Unfortunately, I had 0 torque untill about 4500 rpms. My already slow base 250 just got even slower. I always take functionality over form. If it looks ugly but performs good, thats all that matters. Luckily in my case, I had a brand new q300 axelback waiting for me to install. The install went super smooth and it still sounds absolutely amazing. Albeit, it isnt as loud as no mufflers, but it still has a nice rich tone + all the torque you previously had.

E46CT

as for why people do it, It achieves two things for some: the perception of bad *** (hear my car ROAR!!). and it's also cheapskate friendly (free to chop stuff off)

Mufflers exist for a reason, folks.

don't draw attention to a slow car

issafsport

swaangin

Staying on this topic, torque loss is due to a loss of back pressure because you're opening up the exhaust flow more. Don't exhaust systems do the same thing? In fact, you're opening up the exhaust even more with an exhaust system vs a muffler delete, so wouldn't the loss of torque be even more in this case?

As to why I would do it, just so it sounds better, I've never done it before but my friend has it done on his M3 and it sounds really good.

E46CT

I think the whole "backpressure" thing is a myth created and dispersed around the internet a decade or more go. It makes sense. Impeding airflow would not give you more torque. The faster the air can move out (and thus in) the easier your engine will make power. Someone did a video on this:

TOPENDMS

Exhaust pressure is not a myth. Each engine has a prefered exhaust pressure to run optimally. If your changing your vehicle from street ready to race ready .. that ideal pressure will change, mostly when increasing air intake and HP, or even just driving at higher rpms than the factory assumed would be ideal.

The muffler is primarily for sound. You may like it without a sound tuned muffler for some reason, but please don't do that for the rest of the worlds sake.

swaangin

Do you mind making a video of the sound?

swaangin

Is it really going to be that loud? I didn't think it would be obnoxious, I just wanted a bit more rumble.

E46CT

Nobody said exhaust pressure is a myth. Of course exhaust pressure itself is not a myth. you can feel the air blowing out the back.

Back pressure being essential for torque is said to be a myth. Take a look at the engineer's video.

yungicon

I don’t really fit into this category but I have a 350 that I got the mufflers deleted. I can’t say if I feel a loss of torque since I removed them pretty quick after I got the car but it definitely is a cheap and easy way to make the car sound good.

Pittsy

FROM PERSONAL EXPERIENCE*******

When i ran without mufflers at all (open midpie) I didnt have any torque or "umph" when standing on the gas. (yes trac and vsc was off) just my personal experience with my base 250.

swaangin

What if I tell the muffler shop to weld in a pipe of 1.75" - 2" diameter? Less torque loss due to it being the same type of restriction? Anyone know the diameter of the current muffler?

tuandino

My son just deleted his muffler on his 3is 200t f-sport. I drive it several times after the delete and not noticing any torque loss. Not gonna lie, it sounds really good... throaty low rumble. it's louder but not too loud. If anyone is into the bike scene, it sounds like Two Brothers exhaust.