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Thread: Stock muffler question

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  1. #1
    No Traction due to Paxton PaxtonShelby's Avatar
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    Stock muffler question

    Does anyone know if the stock 2011+ GT mufflers are the same as the Boss 302 mufflers?
    2014 GT Premium - Sterling Gray Metallic - MT82 - Track Pack - Glass Roof - Recaro seats - Spoiler delete
    12.76 @ 114.04 bone stock. Koni yellow coil-overs, BMR watts, LCA and LCA relo brackets, Borla S-type axle back.

    1966 Coupe - 331 stroker - Bullet custom roller cam - cam and motor installed and dyno tuned by Rodeheavers Hot Rod - Astro A5 - McLeod RXT - 486 to the wheels - more fun than my little tires can handle

    1966 Oldsmobile Toronado - currently NOT on jackstands

  2. #2
    Lou Glutz Motors scorpio333's Avatar
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    I don't think so. I recall reading awhile back that the OEM Boss mufflers are actually the same as the V6 mufflers.
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    No Traction due to Paxton PaxtonShelby's Avatar
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    Thanks for the info. That really surprises me...since the Boss, even with the side-exit restrictor plates installed, has a really nice rumble.
    2014 GT Premium - Sterling Gray Metallic - MT82 - Track Pack - Glass Roof - Recaro seats - Spoiler delete
    12.76 @ 114.04 bone stock. Koni yellow coil-overs, BMR watts, LCA and LCA relo brackets, Borla S-type axle back.

    1966 Coupe - 331 stroker - Bullet custom roller cam - cam and motor installed and dyno tuned by Rodeheavers Hot Rod - Astro A5 - McLeod RXT - 486 to the wheels - more fun than my little tires can handle

    1966 Oldsmobile Toronado - currently NOT on jackstands

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    Nothing clever to say.... jaa55's Avatar
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    I think they are the same except for the tip size on the end of the muffler. I remember when they had the special on the boss on speed they said the exhaust was largely the same from the GT with the exception of the H-pipe
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  5. #5
    Go big or go home... gmslayer's Avatar
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    Muffler

    Quote Originally Posted by jaa55 View Post
    I think they are the same except for the tip size on the end of the muffler. I remember when they had the special on the boss on speed they said the exhaust was largely the same from the GT with the exception of the H-pipe

    Correct. Let me know if you need a photo.


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    No Traction due to Paxton PaxtonShelby's Avatar
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    Thanks Jim! By the way - I told a buddy about your car. He sounded interested. He installed the Paxton on my '66 and is a lifetime Ford nut. His name is Joe - great guy.
    2014 GT Premium - Sterling Gray Metallic - MT82 - Track Pack - Glass Roof - Recaro seats - Spoiler delete
    12.76 @ 114.04 bone stock. Koni yellow coil-overs, BMR watts, LCA and LCA relo brackets, Borla S-type axle back.

    1966 Coupe - 331 stroker - Bullet custom roller cam - cam and motor installed and dyno tuned by Rodeheavers Hot Rod - Astro A5 - McLeod RXT - 486 to the wheels - more fun than my little tires can handle

    1966 Oldsmobile Toronado - currently NOT on jackstands

  7. #7
    Formerly 2011 GB/CS & CST 03 03 OW SVT's Avatar
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    Ron, the stock mufflers don't provide much sound if thats what your looking for. It was the first mod I did to my car. I put Stainless Works on mine and it still wasn't loud enough so I removed the cats. Now it sounds great but its getting Headers next.
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    Quote Originally Posted by 2011GB/CS View Post
    Ron, the stock mufflers don't provide much sound if thats what your looking for. It was the first mod I did to my car. I put Stainless Works on mine and it still wasn't loud enough so I removed the cats. Now it sounds great but its getting Headers next.
    After hearing Jim's ( jaa55 ) supercharged GT with the Boss side-exit exhaust and stock Mustang axle-backs ( awesome!! ), I'm seriously considering going with the same setup when I get my car.
    2014 GT Premium - Sterling Gray Metallic - MT82 - Track Pack - Glass Roof - Recaro seats - Spoiler delete
    12.76 @ 114.04 bone stock. Koni yellow coil-overs, BMR watts, LCA and LCA relo brackets, Borla S-type axle back.

    1966 Coupe - 331 stroker - Bullet custom roller cam - cam and motor installed and dyno tuned by Rodeheavers Hot Rod - Astro A5 - McLeod RXT - 486 to the wheels - more fun than my little tires can handle

    1966 Oldsmobile Toronado - currently NOT on jackstands

  9. #9
    Nothing clever to say.... jaa55's Avatar
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    Point him my way!
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    01 cobra: traded

    93 LX Modular 4v swap
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  10. #10
    Senior Member Seer's Avatar
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    They're similar to stock mufflers, just a larger tip.

    The only V8 car that has different mufflers is the GT500.

    The GT does in fact have two different sets, one for auto and one for manual though.
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    Quote Originally Posted by Seer View Post
    They're similar to stock mufflers, just a larger tip.

    The only V8 car that has different mufflers is the GT500.

    The GT does in fact have two different sets, one for auto and one for manual though.
    That is good info. Thanks!

    In a perfect world ( one with unlimited funds ) I would go with the Boss 302 side-exit exhaust AND a Borla ATAK axle-back. But for starters, the Boss 302 side-exit with the stock axle back really does sound great.

    I have heard that header swaps on these cars don't yield much in the way of horsepower gains. I'm sure it changes the exhaust note - but for that much money I'm not sure I'd go that route unless I was making so much power that the stock headers were a bottleneck.
    2014 GT Premium - Sterling Gray Metallic - MT82 - Track Pack - Glass Roof - Recaro seats - Spoiler delete
    12.76 @ 114.04 bone stock. Koni yellow coil-overs, BMR watts, LCA and LCA relo brackets, Borla S-type axle back.

    1966 Coupe - 331 stroker - Bullet custom roller cam - cam and motor installed and dyno tuned by Rodeheavers Hot Rod - Astro A5 - McLeod RXT - 486 to the wheels - more fun than my little tires can handle

    1966 Oldsmobile Toronado - currently NOT on jackstands

  12. #12
    Senior Member Seer's Avatar
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    Quote Originally Posted by PaxtonShelby View Post
    That is good info. Thanks!

    In a perfect world ( one with unlimited funds ) I would go with the Boss 302 side-exit exhaust AND a Borla ATAK axle-back. But for starters, the Boss 302 side-exit with the stock axle back really does sound great.

    I have heard that header swaps on these cars don't yield much in the way of horsepower gains. I'm sure it changes the exhaust note - but for that much money I'm not sure I'd go that route unless I was making so much power that the stock headers were a bottleneck.
    If going catless I have seen 18-25r whp gains with headers. So there are nice gains to be made. There is no real tuning to be involved if the maf curve is already correct on a previously tuned car, just need cat overtemp turned off. The trick is to buy a header where the primaries match the firing order properly. Plenty of designs out there still using thr mod motor primary design. Doesnt hurt the car but doesnt give the best results.
    Last edited by Seer; 01-07-2013 at 01:35 PM.
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    Quote Originally Posted by Seer View Post
    If going catless I have seen 18-25r whp gains with headers. So there are nice gains to be made. There is no real tuning to be involved if the maf curve is already correct on a previously tuned car, just need cat overtemp turned off.
    I'm definitely not going catless. Would be nice to be able to put more than 5k miles a year on it, in which case I wouldn't be emissions exempt. The 20 added hp isn't worth the catless stink to me.
    2014 GT Premium - Sterling Gray Metallic - MT82 - Track Pack - Glass Roof - Recaro seats - Spoiler delete
    12.76 @ 114.04 bone stock. Koni yellow coil-overs, BMR watts, LCA and LCA relo brackets, Borla S-type axle back.

    1966 Coupe - 331 stroker - Bullet custom roller cam - cam and motor installed and dyno tuned by Rodeheavers Hot Rod - Astro A5 - McLeod RXT - 486 to the wheels - more fun than my little tires can handle

    1966 Oldsmobile Toronado - currently NOT on jackstands

  14. #14
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    Quote Originally Posted by PaxtonShelby View Post
    I'm definitely not going catless. Would be nice to be able to put more than 5k miles a year on it, in which case I wouldn't be emissions exempt. The 20 added hp isn't worth the catless stink to me.
    I don't notice it :)
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    The BOSS GOT SVT's Avatar
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    ron

    you should consider just adding gt500 mufflers from the get go

    they sound awesome, i did that with my 12 gt and i will be putting them on the boss as well
    Current Stable
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  16. #16
    Modular Ford Performance Wolfpack Speed's Avatar
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    Quote Originally Posted by GOT SVT View Post
    ron

    you should consider just adding gt500 mufflers from the get go

    they sound awesome, i did that with my 12 gt and i will be putting them on the boss as well
    X2 Ron, you are welcome to stop down the shop and listen to mine if you like
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  17. #17
    No Traction due to Paxton PaxtonShelby's Avatar
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    Thanks guys!!

    Mike - I will definitely stop down sometime. I know the GT500 axle-backs sound great - but the Boss 302 side-exits really sound good as well, and are "different".
    2014 GT Premium - Sterling Gray Metallic - MT82 - Track Pack - Glass Roof - Recaro seats - Spoiler delete
    12.76 @ 114.04 bone stock. Koni yellow coil-overs, BMR watts, LCA and LCA relo brackets, Borla S-type axle back.

    1966 Coupe - 331 stroker - Bullet custom roller cam - cam and motor installed and dyno tuned by Rodeheavers Hot Rod - Astro A5 - McLeod RXT - 486 to the wheels - more fun than my little tires can handle

    1966 Oldsmobile Toronado - currently NOT on jackstands

  18. #18
    The BOSS GOT SVT's Avatar
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    i am saying add the gt500 mufflers first as they are like $300 then add the boss side pipes when $ available
    Current Stable
    2013 School Bus Yellow Boss 302
    1993 Red Cobra

    Previous Stable
    2012 White Mustang-Traded
    2004 Competition Orange Terminator - Sold
    2003 Black Cobra-Traded
    1998 Black Cobra-Traded
    1991 White 5.0 Conv-Sold
    1986 Purple 5.0 Trunk-Sold to Psycho 5.0

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    https://www.facebook.com/cruisin.cranberry

  19. #19
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    choices choices choices...
    2014 GT Premium - Sterling Gray Metallic - MT82 - Track Pack - Glass Roof - Recaro seats - Spoiler delete
    12.76 @ 114.04 bone stock. Koni yellow coil-overs, BMR watts, LCA and LCA relo brackets, Borla S-type axle back.

    1966 Coupe - 331 stroker - Bullet custom roller cam - cam and motor installed and dyno tuned by Rodeheavers Hot Rod - Astro A5 - McLeod RXT - 486 to the wheels - more fun than my little tires can handle

    1966 Oldsmobile Toronado - currently NOT on jackstands

  20. #20
    No Traction due to Paxton PaxtonShelby's Avatar
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    That's good to know - I guess going catless with the coyote isn't as smelly as it used to be on the older 5.0s. But I have to keep the cats for inspection purposes. I think the performance and sound will be good enough for me even with the cats on the car.

    My '94 Cobra didn't have cats...but I had it registered with Classic PA Plates, so it was emissions exempt.
    2014 GT Premium - Sterling Gray Metallic - MT82 - Track Pack - Glass Roof - Recaro seats - Spoiler delete
    12.76 @ 114.04 bone stock. Koni yellow coil-overs, BMR watts, LCA and LCA relo brackets, Borla S-type axle back.

    1966 Coupe - 331 stroker - Bullet custom roller cam - cam and motor installed and dyno tuned by Rodeheavers Hot Rod - Astro A5 - McLeod RXT - 486 to the wheels - more fun than my little tires can handle

    1966 Oldsmobile Toronado - currently NOT on jackstands

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