New exhaust got louder

[skareb]

I replaced my exhaust from the cat back with new cherrybomb turbo muffler & stock int. and tail pipe. Now the problem is after a month of driving it now is louder when you give it throttle but at at idle ( the tone is a little deeper but not louder) . My question is there some sort of break-in time for a new exhaust. And just to clarify there is no leaks that I can see that weren't there before.(small leak at manifold to y pipe, that was there before exhaust).

I am interested in any suggestions at all since this is the first non oem muffler I have put on.

 

[rangerbum]

I had a cherrybomb Turbo that after a while started to leak. The muffler assembly itself was coming apart. These mufflers arent welded closed, just creased, and I think The rattle of exhaust might have seperated the joint on mine a little.

 

[skareb]

thanks I will check that. Did you find it fairly loud, I actually don't mind the sound it is more the fact that why is it louder now.

 

[Wicked_Sludge]

is this a packed muffler? if so, then yes there is a break in period during which the muffler will get louder and change tone.

 

[skareb]

I don't think it is packed it is there turbo muffler. Is it possible the old cats can have something to do with it. It is not loud inside the cab , you can hear it but not over the radio at lowere volume (kids in truck).

 

[Wicked_Sludge]

knock on the casing of the muffer. does it go "tock, tock", or does it make a more hollow "ting, ting"?

i doubt your cats have anything to do with it unless your spitting substrate out the tailpipe.

 

[rangerbum]

thanks I will check that. Did you find it fairly loud, I actually don't mind the sound it is more the fact that why is it louder now.

It was fairly loud. Mine was dumped out the passenger side in front of the rear tire. I thought it sounded ok at first, but when the casing started to make a sort of tapping air sound because the leaks it pissed me off.

 

[skareb]

I think I found the problem but is way to cold out to investigate further. There seems to be a small leak at the top of the back cat and it has gotten worse. Now the thing won't rev above 3grand. maybe time for new cats.

 

[LittleHorse]

I had a pretty loud car once that suddenly got Lexus-silent and had very little power on the throttle, but sounded normal at idle. Turns out a huge piece of substrate had broken loose and was being pushed back by exhaust gas and blocking the pipe, and when I let off it would rock back into the converter shell.

That was basically a useless anecdote, but to get back to the point many exhausts do "break in" over time and become louder or otherwise change sound. I've even seen it with mufflers that had no packing, I don't know if some of the metal expands when it heats up or realigns the atomic structure or what.

Sounds like your leak may be it, but if your exhaust gets louder again and you can't find a leak, you'll have your answer.

 

[rurouni20xx]

most exhausts do have a break in time, the baffles in my flowmaster actually moved a hair and they do rot out a little bit from the heat. packing style mufflers (fart cans) def get louder as they go along and eventually the packing itself will rot out and leave you w/ a semi hollow canister that makes hellacious noise. gas expansion canisters (turbo mufflers, flowmasters, magnaflows, etc.) actually rot out a lil, the turbos holes get slightly larger and the baffles edges round some, some actually rot little holes in them in time. in time, usually a few months, the expansion canisters get a little louder but not much, and hold up the best/longest. give a fart can a year and youll be putting in earplugs or changing it out.

 

[LittleHorse]

give a fart can a year and youll be putting in earplugs or changing it out.

it's unfortunate that manufacturers of car mufflers have not followed the example of motorcycle mufflers and provided any sort of provision for re-packing. Just about any high end dirt bike muffler will have screws or rivets that will allow the end to be removed and the packing be replaced.

 

[rurouni20xx]

it's unfortunate that manufacturers of car mufflers have not followed the example of motorcycle mufflers and provided any sort of provision for re-packing. Just about any high end dirt bike muffler will have screws or rivets that will allow the end to be removed and the packing be replaced.

thats correct, i replace that packing every so often in sport/dirtbikes. the cruiser chambered mufflers/removable baffle straights last forever as long as they are taken care of. but for the most part a fart can can be replaced for cheaper than it would be to have it repacked, the packing for a dirtbike can run 30 bux a bag and you need 2 bags for one full sized street muffler. a car fart can can be as little as 65 dollars (thats how much mine were at autozoo) and its more cost effective that way. i personally dont have much experience w/ the more costly fart can mufflers, some run 650 dollars on a system, but for the price ill go w/ the resonation chamber (flowmaster/magnaflow) mufflers. i agree tho it is a shame because the extra flow on the fart can w/ proper tuning can really help the hp numbers.

 

[LittleHorse]

good point...I guess I never paid attention to what fart cans cost because I've never used one.

After paying what I did for a Yoshimura stainless full system on my Suzuki DRZ400SM, I'll gladly pay for the packing. amazing how a system for a dirt bike can cost the same or more as a car despite using a fraction of the materials.

 

[rurouni20xx]

the internals on a motorcycle pipe are custom tuned to fit the application, the car fart can is universal, meaning youd have to tune the engine around it. the ones that are higher in price are tuned to fit the vehicle. believe it or not there is some technology going into a real fart can on bikes/cars, the length of the endcap and straight pipe in the tip affects torque output, and the length and size of the inner core diameter, plus the size of the inlet holes for the packing and the amount (diameter) of the packing affect the sound and output/backpressure to the engine at idle. it does produce a fair amount of backpressure compared to a straight pipe which makes the vehicle idle and have better torque/hp numbers while still having the flow characteristics of a straight pipe. the original concept was first experimented on 2 stroke dirtbikes by changing the size and shape of the bends to make the sound waves tune the backpressure at certain rpms on the header pipe. thats why there are so many bends and wierd shapes on those bikes, later on when four strokes were experimented w/ they found that modifying the output retuned the whole system, and when dg came out w/ their version of a fart style can for a four stroke dirtbike thats when the technology and demand started making its way to what it is today on bikes. cars i can imagine were the same way w/ glasspacks as changing the length and diameter affect output on those as well since glasspacks are basically the same concept as fart cans just inline and not mounted on the end of the pipe.