slp dual/dual with a cam
I bought mine from SLP and checked it before I put it on. It didn't have the restrictor but still was VERY quiet. Now that I have that muffler off the car, it's hard to beleive that it supposedly flows so good. When you look at the guts, it sure doesn't look free flowing.
this exact exhasut was on my roommates car and it is a 408 H/C/I car and it picked up 28 hp from going through the exhaust to opening the cutouts. BTW it is the dual dual that is on the left.
cody161....i think that is the difference in sound from yours to others....my original D/D was like the one on the right...i heard one that is on the left and definitly better sounding. The one on the right is 2 1/2 inch into the muffler and the one on the left is 3 inches. Also interested in what restricter plate you took out, i thought GM and SLP stopped putting those in there mufflers after 1998?
Thats why i just purchased this from someone on here.
Thats why i just purchased this from someone on here.
when i took mine apart you could tell where it had already been removed. i'm not sure what year car this one come off of but it was a used one so i'll have to do some checking.
I'm hoping to get a little tamer sound after putting the headers and cam in.....the GMMG is just a little to loud around town and with the top down. Kids won't like the tamer sound, but it won't be such a cop magnet when i give it a little gas...and maybe i'll be able to hear the radio.
cody161....i think that is the difference in sound from yours to others....my original D/D was like the one on the right...i heard one that is on the left and definitly better sounding. The one on the right is 2 1/2 inch into the muffler and the one on the left is 3 inches. Also interested in what restricter plate you took out, i thought GM and SLP stopped putting those in there mufflers after 1998?
Thats why i just purchased this from someone on here.
Thats why i just purchased this from someone on here.
Are you saying this because of the HP loss? I'm told these D/D setups are good until 400HP with maybe 10HP loss?? My current setup is a GMMG catback with a special GMMG chambered i-pipe, and my tuner says the i-pipe is robbing 20 HP and maybe 30 on the torque, and it's to loud for my taste. Maybe i just cut out the existing D/D muffler and replace it with ????
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My car came with the SLP dual dual from the factory but it has a nasty 2 1/2" I pipe that goes over the axle. It is a serious crush bend, I gain 17hp and 14tq just from opening the cutout. I even cut the left side tailpipe off looking for the "ring of silence" restrictor but sadly it was not there.
specifically part # 343SC. It had the same pipe configuration but about 4.5 inches shorter (and about 7 lbs lighter) than the SLP. Just used a 4.5" section of 2.5 inch diam pipe on the drivers side to extend out to the existing dual/dual tail pipe. Passenger side inlet and dual/dual tail pipe bolted right up.
i have the newer version of the slp dual dual. it looks no different than the restricted on the out side. i had cut outs installed and only gained 1 mph at the track being open. i ran the same et's through the exhaust. the D/D exhaust in the pic on the right that has the single tips is the GM factory ss catback. it has nothing to to with the slp catback on the right. even with the restricter plate removed from the slp exhaust there isn't much gain on the dyno. it's been proven many times that the slp dual/dual catback is the one of the best flowing 3 inch catbacks. i wouldn't trade my slp dual dual for anything. i have another slp dual dual thats never been cut sitting in my garage. if you want you slp dual dual a little louder, take the muffler off...soak the the inside with gas and burn the fiberglass packing out. i did this before and it made a bigger sound difference over removing the restricter plate located in the driver side tail pipe that very FEW catbacks had.
Just FYI. Take a look at the picture on the left. That's the inlet of the SLP Dual/Dual muffler. Exhaust goes to the end, gets caught in that little ring at the other end of the muffler, then has to make a 90 degree turn to go towards the tailpipe side of the muffler. When it gets there it has to make another 90 degree turn, either right or left to go out the tailpipes. Picture on the right is looking thru one tailpipe outlet to the other one.
Some people take pictures of birds or scenery, I take pictures of the insides of mufflers. LOL
Some people take pictures of birds or scenery, I take pictures of the insides of mufflers. LOL
Just FYI. Take a look at the picture on the left. That's the inlet of the SLP Dual/Dual muffler. Exhaust goes to the end, gets caught in that little ring at the other end of the muffler, then has to make a 90 degree turn to go towards the tailpipe side of the muffler. When it gets there it has to make another 90 degree turn, either right or left to go out the tailpipes. Picture on the right is looking thru one tailpipe outlet to the other one.
Some people take pictures of birds or scenery, I take pictures of the insides of mufflers. LOL
Some people take pictures of birds or scenery, I take pictures of the insides of mufflers. LOL
Are you saying this because of the HP loss? I'm told these D/D setups are good until 400HP with maybe 10HP loss?? My current setup is a GMMG catback with a special GMMG chambered i-pipe, and my tuner says the i-pipe is robbing 20 HP and maybe 30 on the torque, and it's to loud for my taste. Maybe i just cut out the existing D/D muffler and replace it with ????
Thanks for all the input
I think i'm going to throw the D/D in and dyno the car...since i have a dyno with the GMMG, i'll be able to compare the two. I guess it all comes down to personal taste, since some people love it and some don't. I think i've spent close to 2k screwing around with different setups....and everytime i do a new mod things change
I guess thats what keeps the sponsers on this site in business!
I think i'm going to throw the D/D in and dyno the car...since i have a dyno with the GMMG, i'll be able to compare the two. I guess it all comes down to personal taste, since some people love it and some don't. I think i've spent close to 2k screwing around with different setups....and everytime i do a new mod things change
I guess thats what keeps the sponsers on this site in business! 
Thanks for all the input
I think i'm going to throw the D/D in and dyno the car...since i have a dyno with the GMMG, i'll be able to compare the two. I guess it all comes down to personal taste, since some people love it and some don't. I think i've spent close to 2k screwing around with different setups....and everytime i do a new mod things change I guess thats what keeps the sponsers on this site in business!
I think i'm going to throw the D/D in and dyno the car...since i have a dyno with the GMMG, i'll be able to compare the two. I guess it all comes down to personal taste, since some people love it and some don't. I think i've spent close to 2k screwing around with different setups....and everytime i do a new mod things change
I guess thats what keeps the sponsers on this site in business! I'd love to see a before and after video of the GMMG vs. the Dual/Dual. My brother has the factory installed SLP Dual/Dual on his 02 SS and would like to install GMMG and I'm sure he'll eventually want to upgrade his cam. So any vids or sounds clips would be a wonderful insite on what his car may sound like with the 224 cam with GMMG and Dual/Dual.
Take it out mid March....i'll vid the change and post.