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When you chop a hole in a muffler, you allow more air to escape and that reduces back pressure. You need back pressure to maintain torque. Can you folks that cut holes in your mufflers honestly tell me that you have not felt a loss of performance in the kick in the pants feeling torque gives you when you throttle up?
The point where these holes are made there is no effect to the "back pressure" of the motor. As mentioned the NPP mufflers provide more HP and TQ when the valves are opened which provides an additional exhaust port for the air to escape. There is a reason that the exhausts that provide the bigger increase in performance are less restrictive and not more restrictive. Back Pressure and Scavenging are two different things.
I can honestly tell you there has been absolutely no loss of performance felt after doing this minor modification to the muffler.
I have a 2005 Z51 , the mufflers are stock dual tips & pipes on each side , not like the picture of dual tips into one pipe into muffler end .
so on mine where would you drill ?
also if I look into the end of each tip, looks like a baffle / wall , can you drill through that and get some extra noise
pictures of this style muffler mod would help , info please
I have a 2005 Z51 , the mufflers are stock dual tips & pipes on each side , not like the picture of dual tips into one pipe into muffler end .
so on mine where would you drill ?
also if I look into the end of each tip, looks like a baffle / wall , can you drill through that and get some extra noise
pictures of this style muffler mod would help , info please
Can you take a picture of your mufflers please? The stock 2005 muffler should not have a baffle or wall. Did you get your 2005 users? Possible previous owner installed the NPP muffler.
got it used, but all stock , what are NPP's ? no baffle to open like the Z06 , but it has dual tips dual pipes going into the muffler end and definitely a metal wall /baffle
got it used, but all stock , what are NPP's ? no baffle to open like the Z06 , but it has dual tips dual pipes going into the muffler end and definitely a metal wall /baffle
I am confused now. Your previous post mentioned you see a baffle/wall but now you are saying there is no baffle. I think it would be best for you to take a picture of your muffler and post it. This way we can see what you actually have.
from what I have seen of 2005 factory mufflers they have one exit pipe split into 2 tips for each side
mine are 2 exit pipes 2 tips for each side , mufflers are pretty much large round polished [ not at all oval ] no markings on sides or botton , can't see tops
kinda look like Borla , but round mufflers
ok,,, baffle's are not movable /rotating type ,,,but like solid baffle at the end of each pipe at the muffler opening 10" in from end of tips
will take pictures and post
Last edited by nobucks; 10-24-2019 at 02:18 PM.
Reason: pictures
from what I have seen of 2005 factory mufflers they have one exit pipe split into 2 tips for each side
mine are 2 exit pipes 2 tips for each side , mufflers are pretty much large round polished [ not at all oval ] no markings on sides or botton , can't see tops
kinda look like Borla , but round mufflers
ok,,, baffle's are not movable /rotating type ,,,but like solid baffle at the end of each pipe at the muffler opening 10" in from end of tips
will take pictures and post
that is my guess also, but have no idea who's ? but it is way to quite , why I wanted to find out about the baffles /plates at the end of the tubes, if you can drill holes in them ?
that is my guess also, but have no idea who's ? but it is way to quite , why I wanted to find out about the baffles /plates at the end of the tubes, if you can drill holes in them ?
Those aren't baffles. I don't see any way to remove the metal strips back at the can area. The tips are similar to bullets but definitely are not. I've seen a lot of Corvette exhaust systems but never this one.
pictures are deceiving, inside / looking up the tip /tubes where the tube meets the body of the muffler there is a metal wall / baffle .look at last picture , see the yellow reflection area, that is metal / baffle ,, these were most likely put on by the original owner, this is a 05 Z51 , so the mufflers could be that old ? but car has 50,000 miles now i'm the 2nd owner , he is long gone dead,,,
Last edited by nobucks; 10-24-2019 at 03:12 PM.
Reason: more info
pictures are deceiving, inside / looking up the tip /tubes where the tube meets the body of the muffler there is a metal wall / baffle .look at last picture , see the yellow reflection area, that is metal / baffle ,, these were most likely put on by the original owner, this is a 05 Z51 , so the mufflers could be that old ? but car has 50,000 miles now i'm the 2nd owner , he is long gone dead,,,
I see a something back at the cans but it’s certainly not something you can get to easily.
they look like really good quality mufflers / connecting pipes and install , all real good quality welds etc, i'm a metal fab /welder retired after 50 years doing it , not a Mexican chop job ? plus I'm a poor white boy . lol
stuck a 1/2 " dia. steel rod up 16 " long and hit it with a large hammer like 3 good wacks,, solid as **** , did not move , can get a drill bit w/ extension up easy, mighy try holes , no not in my head , lol
This is only a guess but it looks like an older version of the B&B PRT exhaust. I believe their first gen of the PRT were just like that. 4 tips individually welded to the mufflers. The more recent version of the PRT has a single Y pipe connection to split into 2 tips per muffler.
Well, it's 90 degrees out here in Southern California @ 3 pm , think I will go light up the tires on the Vette, the Hondas & Toyotas will want to race, may the best win the rice cookie
02-23-2015, 03:14 PM
