okay guys help me out here
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Car: 1999 Trans Am M6
Mods: Baby Comp Cam XR265HR (212/218 - .522/.529 - 114), Mac mids with ORY, Cutout, LS6 Intake, Slp lid, UD pulley, Flowmaster, 3.73's, BMR LCA's, Panhard, and STB, mild tune.
These mods netted me somewhere around 345 / 350 cutout closed and 366 / 369 cutout open (cant find the dyno graph from the run with cutout closed). My question for the board is what kind of gains over the graph with the cutout closed could I get by swapping the Mac mids for LT's and throwing a 3" catback like a Magnaflow on there? Im trying to get opinions to see if swapping out the exhaust would be worth it monetarily. Thanks!
Also curious what some of you think the car might be capable of at the track with the current mods
Mods: Baby Comp Cam XR265HR (212/218 - .522/.529 - 114), Mac mids with ORY, Cutout, LS6 Intake, Slp lid, UD pulley, Flowmaster, 3.73's, BMR LCA's, Panhard, and STB, mild tune.
These mods netted me somewhere around 345 / 350 cutout closed and 366 / 369 cutout open (cant find the dyno graph from the run with cutout closed). My question for the board is what kind of gains over the graph with the cutout closed could I get by swapping the Mac mids for LT's and throwing a 3" catback like a Magnaflow on there? Im trying to get opinions to see if swapping out the exhaust would be worth it monetarily. Thanks!
Also curious what some of you think the car might be capable of at the track with the current mods
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Car: 1999 Trans Am M6
Mods: Baby Comp Cam XR265HR (212/218 - .522/.529 - 114), Mac mids with ORY, Cutout, LS6 Intake, Slp lid, UD pulley, Flowmaster, 3.73's, BMR LCA's, Panhard, and STB, mild tune.
These mods netted me somewhere around 345 / 350 cutout closed and 366 / 369 cutout open (cant find the dyno graph from the run with cutout closed). My question for the board is what kind of gains over the graph with the cutout closed could I get by swapping the Mac mids for LT's and throwing a 3" catback like a Magnaflow on there? Im trying to get opinions to see if swapping out the exhaust would be worth it monetarily. Thanks!
Also curious what some of you think the car might be capable of at the track with the current mods![Happy](https://ls1tech.com/forums/images/smilies/LS1Tech/gr_stretch.gif)
Mods: Baby Comp Cam XR265HR (212/218 - .522/.529 - 114), Mac mids with ORY, Cutout, LS6 Intake, Slp lid, UD pulley, Flowmaster, 3.73's, BMR LCA's, Panhard, and STB, mild tune.
These mods netted me somewhere around 345 / 350 cutout closed and 366 / 369 cutout open (cant find the dyno graph from the run with cutout closed). My question for the board is what kind of gains over the graph with the cutout closed could I get by swapping the Mac mids for LT's and throwing a 3" catback like a Magnaflow on there? Im trying to get opinions to see if swapping out the exhaust would be worth it monetarily. Thanks!
Also curious what some of you think the car might be capable of at the track with the current mods
![Happy](https://ls1tech.com/forums/images/smilies/LS1Tech/gr_stretch.gif)
Low to mid 12s@113 or so? I don't guess M6 times very well at all.
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Thanks for your input Lemons....before posting this I went through a thread in search that was a big debate about Mac mids and LT's. Some argued that gains would near 15-20 HP, especially lower in the curve with the LT's. They talked about how LT's "scavenge" better? Others said gains would be minimal up top. I dont have much experience with dynos, your thoughts on that?
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Thanks for your input Lemons....before posting this I went through a thread in search that was a big debate about Mac mids and LT's. Some argued that gains would near 15-20 HP, especially lower in the curve with the LT's. They talked about how LT's "scavenge" better? Others said gains would be minimal up top. I dont have much experience with dynos, your thoughts on that?
If you had a larger cam you would see more gains but having that size cam it will not effect much.
#5
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Car: 1999 Trans Am M6
Mods: Baby Comp Cam XR265HR (212/218 - .522/.529 - 114), Mac mids with ORY, Cutout, LS6 Intake, Slp lid, UD pulley, Flowmaster, 3.73's, BMR LCA's, Panhard, and STB, mild tune.
These mods netted me somewhere around 345 / 350 cutout closed and 366 / 369 cutout open (cant find the dyno graph from the run with cutout closed). My question for the board is what kind of gains over the graph with the cutout closed could I get by swapping the Mac mids for LT's and throwing a 3" catback like a Magnaflow on there? Im trying to get opinions to see if swapping out the exhaust would be worth it monetarily. Thanks!
Also curious what some of you think the car might be capable of at the track with the current mods![Happy](https://ls1tech.com/forums/images/smilies/LS1Tech/gr_stretch.gif)
Mods: Baby Comp Cam XR265HR (212/218 - .522/.529 - 114), Mac mids with ORY, Cutout, LS6 Intake, Slp lid, UD pulley, Flowmaster, 3.73's, BMR LCA's, Panhard, and STB, mild tune.
These mods netted me somewhere around 345 / 350 cutout closed and 366 / 369 cutout open (cant find the dyno graph from the run with cutout closed). My question for the board is what kind of gains over the graph with the cutout closed could I get by swapping the Mac mids for LT's and throwing a 3" catback like a Magnaflow on there? Im trying to get opinions to see if swapping out the exhaust would be worth it monetarily. Thanks!
Also curious what some of you think the car might be capable of at the track with the current mods
![Happy](https://ls1tech.com/forums/images/smilies/LS1Tech/gr_stretch.gif)
But hey, what do I know. I'm a Ford guy, the only time my car had a Y pipe in the exhaust was when it was turned around backwards and the car had a snail in front of it.
![Devil](https://ls1tech.com/forums/images/smilies/LS1Tech/gr_devil.gif)
And boy is that one itty bitty cam for a 346cid motor! Bet that thing sounds milder than it did stock!
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Welp....I'll give this a shot. You went from 345/350 to 366/369 by opening up your exhaust. So obviously your car needs a better flowing exhaust. By "cutout" I assume you mean you still have the headers going into a Y then back. I would start out by going to a dual 2.5" or 3" exhaust. I think you would gain more there over a set of longtubes. Seems the headers aren't whats holding you back exhaust wise.
But hey, what do I know. I'm a Ford guy, the only time my car had a Y pipe in the exhaust was when it was turned around backwards and the car had a snail in front of it.![Devil](https://ls1tech.com/forums/images/smilies/LS1Tech/gr_devil.gif)
And boy is that one itty bitty cam for a 346cid motor! Bet that thing sounds milder than it did stock!
But hey, what do I know. I'm a Ford guy, the only time my car had a Y pipe in the exhaust was when it was turned around backwards and the car had a snail in front of it.
![Devil](https://ls1tech.com/forums/images/smilies/LS1Tech/gr_devil.gif)
And boy is that one itty bitty cam for a 346cid motor! Bet that thing sounds milder than it did stock!
I would stay away from a TD setup unless you want to spend money, it is not cheap but sounds SOOOOOOO GOOD!!!!!!!!
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Welp....I'll give this a shot. You went from 345/350 to 366/369 by opening up your exhaust. So obviously your car needs a better flowing exhaust. By "cutout" I assume you mean you still have the headers going into a Y then back. I would start out by going to a dual 2.5" or 3" exhaust. I think you would gain more there over a set of longtubes. Seems the headers aren't whats holding you back exhaust wise.
But hey, what do I know. I'm a Ford guy, the only time my car had a Y pipe in the exhaust was when it was turned around backwards and the car had a snail in front of it.![Devil](https://ls1tech.com/forums/images/smilies/LS1Tech/gr_devil.gif)
And boy is that one itty bitty cam for a 346cid motor! Bet that thing sounds milder than it did stock!
But hey, what do I know. I'm a Ford guy, the only time my car had a Y pipe in the exhaust was when it was turned around backwards and the car had a snail in front of it.
![Devil](https://ls1tech.com/forums/images/smilies/LS1Tech/gr_devil.gif)
And boy is that one itty bitty cam for a 346cid motor! Bet that thing sounds milder than it did stock!
![Sad](https://ls1tech.com/forums/images/smilies/LS1Tech/gr_sad.gif)
Since dad was paying for the rebuild, he got to choose the cam. I wasnt happy about it but I couldnt afford to do what he did so I just went with it. Yes it does sound stock (my previous cam had big lope, etc).
![Sad](https://ls1tech.com/forums/images/smilies/LS1Tech/gr_sad.gif)
Also, thanks for your input as well. The cutout is at the beginning if the I pipe, so I guess we see how restrictive the rest of my exhaust is.
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it actually works out very well, and some members on here have been runnin them for quite a while with excellent results. if i wanted tips and cared about loudness thats the way i would go with my setup, but i prefer the looks/sound of it being dumped on mine personally
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I appreciate everyones input so far. I think I am going to replace the Macs with some Ebay stainless or Pacesetters if I find a good deal on some used ones. Then I am going to have the exhaust place run 3" back through a magnaflow and keep the cutout in the new I pipe. Speaking of that...will I need a new one since id be running bigger pipe? Also if you guys know of a more aggressive sounding muffler than Magnaflow I would probably try it. This will just be a temp setup until Im out of college and then Ill move towards Kooks, ARH, etc
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Don't need them, I want them! ![Cheers!!](https://ls1tech.com/forums/images/smilies/LS1Tech/gr_cheers.gif)
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If it were me I would probably put your money somewhere else.. But it is up to you.
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I appreciate everyones input so far. I think I am going to replace the Macs with some Ebay stainless or Pacesetters if I find a good deal on some used ones. Then I am going to have the exhaust place run 3" back through a magnaflow and keep the cutout in the new I pipe. Speaking of that...will I need a new one since id be running bigger pipe? Also if you guys know of a more aggressive sounding muffler than Magnaflow I would probably try it. This will just be a temp setup until Im out of college and then Ill move towards Kooks, ARH, etc ![Driving](https://ls1tech.com/forums/images/smilies/LS1Tech/gr_driving3.gif)
![Driving](https://ls1tech.com/forums/images/smilies/LS1Tech/gr_driving3.gif)
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Ive had the Macs since 2003 and I bought them used at that point....so no telling how many miles total there are on them. Im here a "clicking" noise when I accelerate and once that started is when I began thinking of getting new headers. Any ideas as to what that clicking sound might be if not an exhaust leak of some kind?