nias9527

May I ask what is the difference between glasspacks and mufflers???
does glasspacks produce more AMG-like sound or aftermarket muffler??
any recommendation??

Benz-o-matic

If you dont mind me asking what glasspacks did you use and what xpipe?

Benz-o-matic

Glasspacks are a more old fashioned type of muffler, literally a small pipe containing fiberglass. It is less effective than a traditional modern muffler allowing higher flow and greater sound. They are popular when doing custom exhaust on trucks and muscle cars. Cherry bomb is a very popular and well known type.

jctevere

I wouldn't say that glasspacks are "old fashioned" mufflers, but rather, different. While "Glasspacks" are the traditional names, not all of them contain fiberglass packing to reduce resonance (magnaflow glasspacks as an example, don't use fiberglass). Also, they are not less "effective" than traditional modern mufflers, and definitely are significantly LOUDER than modern mufflers... So I am not quite sure where you got your information from there

In fact, many tests using leading high performance mufflers (flowmaster vs magnaflow vs glasspacks) show that glasspacks almsot always outperform or at the very least, tie mufflers in performance, with a few flowmasters showing a decrease in power (all dyno-verified testing).

The glasspacks I had used were cherrybombs. But you can try any variety, the main thing about why glasspacks are so cool is:
1) They are very cheap
2) The sound varies greatly depending on pipe length and dimensions, so you can definitely customize it to get a desired sound.
3) They are much smaller and lighter than traditional mufflers, expanding areas where you can mount them and save weight.

Som glasspacks have been criticized for "wearing out" over time, casuing the sound to change. However, this happens over a span of a few years, and most modern designs (such as magnaflow glasspacks) have prevented this issue altogether.

I personally like them, and heck, for $50 for a pair, its worth trying out to see if you do too...

As far as the x-pipe. I used a magnaflow tru-x stamped stainless steel one. You need 2.25" diamter inlet/outlet for the c300 exhaust.

Benz-o-matic

Lol its quite obvious I know very little about exhaust . Thanks for all the info! The price is definitely nice considering most aftermarket catbacks are at least a grand. What length, inlet, outlet, body diameter were the glasspacks you used?

jctevere

Haha, no sweat, the forum is all for learning. I got two 12" long 2.25" inlet cherrybomb glasspacks. However, some may not like cherry bombs as they are RED. Lol.

If I were to do it again, I would measure the distance of the stock resonator (which is pretty darn long) and/or measure from the cats to the end of the resonator (where the pipes start to bend) and get the optimal pipe size after the length of the x-pipe is taken into account.

For example: Say there is a 36" run from the cats to where the pipe starts to bend to the exhaust tips, and the x-pipe is lets say 10" long. You have a 26" area to work with, so you can get anywhere from 8"-24" depending on preference of sound. (very short ones will be a raspy sound and VERY loud), while longer ones are more traditional and have a deeper tone.

If I could fit in dual 24" long, 2.25" inlet/outlet glasspacks, and the x-pipe between the area from the cats to where the pipes bend to the exhaust tips. I would do that and so then the new pipe install is simple, and can just be straight-piped to the exhaust tips. Saving material, welds, and simplicity, keeping time and costs lower.

Also, I would recommend trying to use clamps wherever possible instead of welding (as this will help resonance). And also, when pipes need to be bent (like the striaght pipes from the glasspacks to the exhaust tips in my proposed setup), see if they can use mandrel bends. Madnrel bends ensure that the pipe doesn't lose shape in the bend, where traditional bends distort pipe shape in the bend and you lose airflow velocity (making it more restrictive). It isn't a HUGE deal, but heck, if the point of this mod is to have free-flowing less restrictive exhaust, why restrict it if you don't have to?

Stevedotmil

^ This is exactly what I was thinking.

Benz-o-matic

Literally the most helpful and detailed write up on modifying c300's exhaust I've seen on the forum in a year. Answered all my questions

nias9527

Ok I think I'm going to get some glass packs if I can find a good deal
do anyone heard of Benzworks.com?? do they have a good reputation??

Normandie4life

yes they do

Mixedfruits

if anyone does this show your setup please pics? Im interested

Mixedfruits

And what do people recommend, My set up right now secondary cats are remove, resonator replaced with x pipe and mufflers remove.

Right now I want it to be less loud at lower rpm, but retain the high pitched growl at higher revs 4.5-6k but not a loud if that make sense.

jctevere

You removed your secondary cats?!?! Lmao, no wonder why youw ant it less loud! Doesn't you car throw an error code - also, since there is no check-sum for the emissions, your car probably doesn't adjust A/F mixture as well as before, and your MPG is suffering.

As far as less sound at lower rpms - put some type of muffler back on it. Glasspacks are considered mufflers, as they muffle the sound - just different than traditional ones. If you don't want glasspacks, go for a high performance free-flowing muffler like magnaflow.

Also - to add on what I said above. Does anyone know if the clamps for the resonator are before or after the resonator (as in, closer to the front of the car, or closer to the back). If they are mounted in front of the resonator, you won't have to do ANY cutting to your stock pipes to have this setup. You can take out the whole system post-cat in one piece.

This way, you can revert to stock quickly, easily, and cheaply. This would also GREATLY simplify install of x-pipe and glasspacks/new mufflers/no mufflers (straight pipe).

And I have learned the hard way, try to have at least one set of clamps in your system near the middle. This will help reduce the annoying resonance and drone you get.

Mixedfruits

so is the longer the glass pack the better? and how long do you suggest I get?

nias9527

should I buy a pair of glasspacks and take them to benzwork ask them to put it on or let them get one for me??
now I like the sound outside of the car but I just want to get rid of that annoying drone inside the car when its like around 2000 rpm...
Does muffler kill the drone better or glasspacks??
and does muffler provide more backpressure or glasspacks because I can feel my car go slower when I floor the gas pedal..

garrett_wong

this maybe a dumb question, but will i have problems smogging or registering my car if i remove my mufflers??

nias9527

nahh
muffler only add noise..
this is what I heard lol
it depends on your local laws

hotcorner216

yea as in youre fine unless u live in california.... :P lol

but my old man does smog...so i get away with what i want lol

garrett_wong

so since i live in ca, should i not have my mufflers cut out?

Stevedotmil

Not unless you want to put then back in every year when your emissions inspection is due.

Benz-o-matic

You just need to get a guy. If any of your friends have illegal exhaust/mods ask them who they go to for inspection.

Mixedfruits

installed 12" glass packs today sound quieter no high pitched at 4-5k maybe have to break in?

nias9527

Hi mixedfruits
is there any drone??? annoying sound??
what do you mean no high pitch sound?? like no growling sound when you floor it??
I am still wondering should I put my stock muffler back or get a glasspacks lol

Mixedfruits

like that sound when we go at around 4.5k-6k love that sound . But there is def. less drone still a bit but not as much Id say It reduced drone by 50%, But to us who drive no muffler daily it may seem only like a 20% decrease. ITs weird I know

nias9527

Is it still loud outside?? lol like when the car is idle..
Do you like the sound with glasspacks better or without them better???
hahaha im so curious