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      05-04-2013, 02:33 PM   #1
insane79
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exhaust tips length change sound?

Hi Guys,
recently i got my exhaust tips of my PE bent by a small accident, the exhaust tips were anyways abit too much out from my rear stock bumper. After the accident the exhaust tips got bent by an inch so the dealer cut the tips length by an inch so they look fine now. Now i feel personally my PE has become much louder then before. I got this PE installed in my car around 300 miles & now after i got the car from the dealer i feel its much louder then before, so was wondering does making the exhaust tips shorter change the car sound? or does the PE become much much louder after few 100 miles? i have attached a pic of the exhaust tips before the accident, are they popping out too much for a pe?

Thanks..
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      05-04-2013, 02:40 PM   #2
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The closer the exit is to being under the car, the louder it will seem from its interior.

The longer out it is, the quieter it will seem from inside the car. A few inches makes a difference. People with AA axle back exhausts can relate and probably notice when they adjust their tips.
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      05-04-2013, 02:43 PM   #3
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The closer the exit is to being under the car, the louder it will seem from its interior.

The longer out it is, the quieter it will seem from inside the car. A few inches makes a difference. People with AA axle back exhausts can relate and probably notice when they adjust their tips.
ooh, so basically it feels louder inside the car but its actually the same amount of sound in db outside the car? you think my exhaust tips were abit too much out for a pe?

Thanks..
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      05-04-2013, 03:00 PM   #4
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ooh, so basically it feels louder inside the car but its actually the same amount of sound in db outside the car? you think my exhaust tips were abit too much out for a pe?

Thanks..
Not necessarily too far as I didn't see what they looked like, but probably far enough that the sound didn't resonate as noticeably into the cabin.

Tips alone usually don't change the pitch of the exhaust note.

Imagine how loud it would "seem" if you had the exit directly under the car (before reaching the bumper's cutout).
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      05-04-2013, 03:04 PM   #5
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so basically the sound from outside should be the same? only the sound exit from the muffler is closer to the car cabin thats why i m finding it louder? hmmmn never thought of that..
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      05-04-2013, 03:36 PM   #6
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Quote:
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Imagine how loud it would "seem" if you had the exit directly under the car (before reaching the bumper's cutout).
You mean like thisssss? Imagine that.
http://www.e90post.com/forums/showthread.php?t=833756
Tell you guys one thing, I thought the exhaust heat wouldn't really heat up my trunk, but when you open it to get whatever, it's pretty warm. Nothing burned though.
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      05-04-2013, 05:46 PM   #7
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well the above pics doesn't have a muffler so offcourse it will be loud
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      05-04-2013, 06:41 PM   #8
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well the above pics doesn't have a muffler so offcourse it will be loud
No doubt, tolerable drone, baaad MPG.
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      05-06-2013, 02:37 AM   #9
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Pulling the tips out further will reduce cabin noise, which is what I have done with my AA exhaust.
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      05-06-2013, 01:59 PM   #10
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I hate how my PE sticks out from the bumper...its too far out and looks riced out from the side. I never thought of cutting the tips, thats a good idea. You have good pics of the shorten tips?
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      11-07-2013, 10:06 AM   #11
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Originally Posted by ska325xi View Post
I hate how my PE sticks out from the bumper...its too far out and looks riced out from the side. I never thought of cutting the tips, thats a good idea. You have good pics of the shorten tips?
sorry for the late reply, a pic of my exhaust tips after the dealer cut them by an inch i think. They do look more subtle now for sure..


Last edited by insane79; 11-07-2013 at 11:55 AM.
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      11-07-2013, 08:39 PM   #12
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Quote:
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sorry for the late reply, a pic of my exhaust tips after the dealer cut them by an inch i think. They do look more subtle now for sure..

That's how I have my P.E too, which does look better than how it was originally installed. It does get louder with time and sounds best in DS mode. There is some cabin noise in D mode at certain speeds, while on the highway, otherwise the only way I hear it is with the windows down.
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      11-08-2013, 01:49 AM   #13
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If anyone notices from a prelci to lci bumper, the prelci rear bumper is smaller, lci rears go further out.
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      11-08-2013, 03:34 AM   #14
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Originally Posted by cgm1978 View Post
That's how I have my P.E too, which does look better than how it was originally installed. It does get louder with time and sounds best in DS mode. There is some cabin noise in D mode at certain speeds, while on the highway, otherwise the only way I hear it is with the windows down.
hmmmn, how many kms/miles did it take for your PE to get loud?

Thanks..
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      11-08-2013, 09:08 AM   #15
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I have had it on for the last six thousand miles, but started noticing a change after about 1,000 miles. My commute is about twenty miles on the highway and to speed up the break in process, i would usually switch to DS half way in to my trip. Winter has started so you probably won't notice it as much, unless it's warm.
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      11-18-2013, 07:00 PM   #16
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Quote:
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Quote:
Originally Posted by insane79 View Post
well the above pics doesn't have a muffler so offcourse it will be loud
No doubt, tolerable drone, baaad MPG.
Muffler delete has nothing to do with mpg.
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      11-27-2013, 10:29 PM   #17
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Yeah, not liking how far the tips sticks out as well. Trying to think of the cleanest way to cut it myself. Still though, that leaves a really short tip.

Maybe cut it completely off the muffler, shorten it from the back-side non-chromed pipe and then weld it back on. Is that what the shop did on yours OP? Just ran down and looked at my exhaust, diffnitely the simplest and probably cleanest way to do it.
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      11-28-2013, 04:28 AM   #18
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Quote:
Originally Posted by Casca View Post
Yeah, not liking how far the tips sticks out as well. Trying to think of the cleanest way to cut it myself. Still though, that leaves a really short tip.

Maybe cut it completely off the muffler, shorten it from the back-side non-chromed pipe and then weld it back on. Is that what the shop did on yours OP? Just ran down and looked at my exhaust, diffnitely the simplest and probably cleanest way to do it.
my exhaust tips got slight bent front the outside by a minor accident, so the dealer cut the exhaust tips from the outside by almost an inch, the end result is nice, less ricer now..
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      12-01-2013, 01:37 PM   #19
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Simple physics, if it's shorter it will be louder. It works the same way with a gun. With a longer pipe, the waves have more time to cancel before being expelled and vice versa, but I wouldn't think you'd notice much difference from such a minor change.
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      12-01-2013, 02:12 PM   #20
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Might be more to do with the noise exit being almost under the car now instead of sticking way out away from everything.
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      12-14-2013, 07:55 PM   #21
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Got a chance to work on the exhaust again today. Didn't need to cut the tips. Problem was I didn't cut enough length off originally and the whole muffler was pushed back to far. It was a late night and I guess I was more about getting it done now than getting it done right. Once I took off a little more, got the dounuts to hang straight up and down, which sucked the tips in a lot.

Before


After


Can get it further in by just cutting more length off and using the clamps to force the muffler to swing in if need be, but I think this looks fine now. No need to cut the tips at all on non-LCI, just take off more where you attach the y-pipe.

Also, I didn't notice any noise increase at all, but the tip is still further out than the bumper, although barely.
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      12-15-2013, 02:54 PM   #22
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wow looks so much better now, clean look but wish the performance exhaust came with better tips as these are wafer thin..
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